21023103132 has 18 divisors (see below), whose sum is σ = 53141733008. Its totient is φ = 7007701032.

The previous prime is 21023103107. The next prime is 21023103151. The reversal of 21023103132 is 23130132012.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 291987508 + ... + 291987579.

Almost surely, 2^21023103132 is an apocalyptic number.

It is an amenable number.

21023103132 is an abundant number, since it is smaller than the sum of its proper divisors (32118629876).

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

21023103132 is a wasteful number, since it uses less digits than its factorization.

21023103132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583975097 (or 583975092 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21023103132 its reverse (23130132012), we get a palindrome (44153235144).

The spelling of 21023103132 in words is "twenty-one billion, twenty-three million, one hundred three thousand, one hundred thirty-two".