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123111444421 = 743409008121
BaseRepresentation
bin111001010101000000…
…0111000111111000101
3102202202211220100211201
41302222000320333011
54004113012210141
6132320121302501
711615550003640
oct1625200707705
9382684810751
10123111444421
1148236223399
121ba39934a31
13b7bc9bb544
145d5c67ca57
153308210031
hex1caa038fc5

123111444421 has 8 divisors (see below), whose sum is σ = 143970858944. Its totient is φ = 103070046240.

The previous prime is 123111444413. The next prime is 123111444481. The reversal of 123111444421 is 124444111321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123111444421 - 23 = 123111444413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123111444421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111444481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204503760 + ... + 204504361.

It is an arithmetic number, because the mean of its divisors is an integer number (17996357368).

Almost surely, 2123111444421 is an apocalyptic number.

It is an amenable number.

123111444421 is a deficient number, since it is larger than the sum of its proper divisors (20859414523).

123111444421 is an equidigital number, since it uses as much as digits as its factorization.

123111444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409008171.

The product of its digits is 3072, while the sum is 28.

Adding to 123111444421 its reverse (124444111321), we get a palindrome (247555555742).

The spelling of 123111444421 in words is "one hundred twenty-three billion, one hundred eleven million, four hundred forty-four thousand, four hundred twenty-one".

Divisors: 1 7 43 301 409008121 2863056847 17587349203 123111444421