123021010621531 has 8 divisors (see below), whose sum is σ = 134228606033664. Its totient is φ = 111817393071720.

The previous prime is 123021010621511. The next prime is 123021010621549. The reversal of 123021010621531 is 135126010120321.

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

It is a cyclic number.

It is not a de Polignac number, because 123021010621531 - 2¹⁷ = 123021010490459 is a prime.

It is a super-2 number, since 2×123021010621531² (a number of 29 digits) contains 22 as substring.

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 123021010621531.

It is not an unprimeable number, because it can be changed into a prime (123021010621511) 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, 994400911 + ... + 994524616.

It is an arithmetic number, because the mean of its divisors is an integer number (16778575754208).

Almost surely, 2^{123021010621531} is an apocalyptic number.

123021010621531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123021010621531 is a deficient number, since it is larger than the sum of its proper divisors (11207595412133).

123021010621531 is a wasteful number, since it uses less digits than its factorization.

123021010621531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988931161.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 123021010621531 its reverse (135126010120321), we get a palindrome (258147020741852).

The spelling of 123021010621531 in words is "one hundred twenty-three trillion, twenty-one billion, ten million, six hundred twenty-one thousand, five hundred thirty-one".