21432231024 has 40 divisors (see below), whose sum is σ = 58623457680. Its totient is φ = 6723836928.

The previous prime is 21432230969. The next prime is 21432231043. The reversal of 21432231024 is 42013223412.

It is a happy number.

It is a super-2 number, since 2×21432231024² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21432230985 and 21432231003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13131679 + ... + 13133310.

It is an arithmetic number, because the mean of its divisors is an integer number (1465586442).

Almost surely, 2^21432231024 is an apocalyptic number.

21432231024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21432231024 is an abundant number, since it is smaller than the sum of its proper divisors (37191226656).

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

21432231024 is a wasteful number, since it uses less digits than its factorization.

21432231024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26265017 (or 26265011 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21432231024 its reverse (42013223412), we get a palindrome (63445454436).

The spelling of 21432231024 in words is "twenty-one billion, four hundred thirty-two million, two hundred thirty-one thousand, twenty-four".