21123464011642 has 16 divisors (see below), whose sum is σ = 31702783156992. Its totient is φ = 10555871195520.

The previous prime is 21123464011619. The next prime is 21123464011667. The reversal of 21123464011642 is 24611046432112.

It is a super-2 number, since 2×21123464011642² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26788663 + ... + 27565909.

It is an arithmetic number, because the mean of its divisors is an integer number (1981423947312).

Almost surely, 2^{21123464011642} is an apocalyptic number.

21123464011642 is a deficient number, since it is larger than the sum of its proper divisors (10579319145350).

21123464011642 is a wasteful number, since it uses less digits than its factorization.

21123464011642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784773.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 21123464011642 in words is "twenty-one trillion, one hundred twenty-three billion, four hundred sixty-four million, eleven thousand, six hundred forty-two".