21022031000 has 64 divisors (see below), whose sum is σ = 50521142880. Its totient is φ = 8181532800.

The previous prime is 21022030979. The next prime is 21022031029. The reversal of 21022031000 is 13022012.

It is a happy number.

It is a super-2 number, since 2×21022031000² (a number of 21 digits) contains 22 as substring.

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, 247082 + ... + 321081.

Almost surely, 2^21022031000 is an apocalyptic number.

21022031000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022031000 is an abundant number, since it is smaller than the sum of its proper divisors (29499111880).

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

21022031000 is a wasteful number, since it uses less digits than its factorization.

21022031000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568221 (or 568207 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21022031000 its reverse (13022012), we get a palindrome (21035053012).

The spelling of 21022031000 in words is "twenty-one billion, twenty-two million, thirty-one thousand".