21423031000 has 64 divisors (see below), whose sum is σ = 57291324480. Its totient is φ = 7345036800.

The previous prime is 21423030997. The next prime is 21423031087. The reversal of 21423031000 is 13032412.

It is a happy number.

It is a super-2 number, since 2×21423031000² (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, 1523217 + ... + 1537216.

It is an arithmetic number, because the mean of its divisors is an integer number (895176945).

Almost surely, 2^21423031000 is an apocalyptic number.

21423031000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21423031000 is an abundant number, since it is smaller than the sum of its proper divisors (35868293480).

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

21423031000 is a wasteful number, since it uses less digits than its factorization.

21423031000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3060461 (or 3060447 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21423031000 its reverse (13032412), we get a palindrome (21436063412).

The spelling of 21423031000 in words is "twenty-one billion, four hundred twenty-three million, thirty-one thousand".