123421266165428 has 24 divisors (see below), whose sum is σ = 269282762543424. Its totient is φ = 48086207596800.

The previous prime is 123421266165427. The next prime is 123421266165433. The reversal of 123421266165428 is 824561662124321.

It is a super-2 number, since 2×123421266165428² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123421266165428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123421266165427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200359198013 + ... + 200359198628.

It is an arithmetic number, because the mean of its divisors is an integer number (11220115105976).

Almost surely, 2^{123421266165428} is an apocalyptic number.

It is an amenable number.

123421266165428 is an abundant number, since it is smaller than the sum of its proper divisors (145861496377996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123421266165428 is a wasteful number, since it uses less digits than its factorization.

123421266165428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400718396663 (or 400718396661 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 53.

The spelling of 123421266165428 in words is "one hundred twenty-three trillion, four hundred twenty-one billion, two hundred sixty-six million, one hundred sixty-five thousand, four hundred twenty-eight".