21001022032 has 20 divisors (see below), whose sum is σ = 41555215296. Its totient is φ = 10277095520.

The previous prime is 21001021991. The next prime is 21001022033. The reversal of 21001022032 is 23022010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001022033) 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, 13962694 + ... + 13964197.

Almost surely, 2^21001022032 is an apocalyptic number.

It is an amenable number.

21001022032 is a deficient number, since it is larger than the sum of its proper divisors (20554193264).

21001022032 is a wasteful number, since it uses less digits than its factorization.

21001022032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27926946 (or 27926940 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21001022032 its reverse (23022010012), we get a palindrome (44023032044).

The spelling of 21001022032 in words is "twenty-one billion, one million, twenty-two thousand, thirty-two".