1211400123 has 4 divisors (see below), whose sum is σ = 1615200168. Its totient is φ = 807600080.

The previous prime is 1211400103. The next prime is 1211400139. The reversal of 1211400123 is 3210041121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211400123 - 2¹² = 1211396027 is a prime.

It is a super-3 number, since 3×1211400123³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211400103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201900018 + ... + 201900023.

It is an arithmetic number, because the mean of its divisors is an integer number (403800042).

Almost surely, 2^1211400123 is an apocalyptic number.

1211400123 is a deficient number, since it is larger than the sum of its proper divisors (403800045).

1211400123 is an equidigital number, since it uses as much as digits as its factorization.

1211400123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403800044.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1211400123 is about 34805.1737964343. The cubic root of 1211400123 is about 1066.0130905139.

Adding to 1211400123 its reverse (3210041121), we get a palindrome (4421441244).

The spelling of 1211400123 in words is "one billion, two hundred eleven million, four hundred thousand, one hundred twenty-three".