21123232102 has 32 divisors (see below), whose sum is σ = 38130036480. Its totient is φ = 8573441760.

The previous prime is 21123232099. The next prime is 21123232133. The reversal of 21123232102 is 20123232112.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21123232102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 884908 + ... + 908464.

It is an arithmetic number, because the mean of its divisors is an integer number (1191563640).

Almost surely, 2^21123232102 is an apocalyptic number.

21123232102 is a deficient number, since it is larger than the sum of its proper divisors (17006804378).

21123232102 is a wasteful number, since it uses less digits than its factorization.

21123232102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26956.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21123232102 its reverse (20123232112), we get a palindrome (41246464214).

The spelling of 21123232102 in words is "twenty-one billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred two".