21024434331 has 16 divisors (see below), whose sum is σ = 31258165920. Its totient is φ = 13966404480.

The previous prime is 21024434323. The next prime is 21024434351. The reversal of 21024434331 is 13343442012.

21024434331 is a `hidden beast` number, since 210 + 2 + 443 + 4 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 21024434331 - 2³ = 21024434323 is a prime.

It is a super-2 number, since 2×21024434331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21024434295 and 21024434304.

It is not an unprimeable number, because it can be changed into a prime (21024434351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1377970 + ... + 1393143.

It is an arithmetic number, because the mean of its divisors is an integer number (1953635370).

Almost surely, 2^21024434331 is an apocalyptic number.

21024434331 is a deficient number, since it is larger than the sum of its proper divisors (10233731589).

21024434331 is a wasteful number, since it uses less digits than its factorization.

21024434331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771403 (or 2771397 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21024434331 its reverse (13343442012), we get a palindrome (34367876343).

The spelling of 21024434331 in words is "twenty-one billion, twenty-four million, four hundred thirty-four thousand, three hundred thirty-one".