21322021431 has 16 divisors (see below), whose sum is σ = 28911548160. Its totient is φ = 13974723840.

The previous prime is 21322021429. The next prime is 21322021447. The reversal of 21322021431 is 13412022312.

It is not a de Polignac number, because 21322021431 - 2¹ = 21322021429 is a prime.

It is a super-2 number, since 2×21322021431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21322021398 and 21322021407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322021411) 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, 66601 + ... + 216978.

It is an arithmetic number, because the mean of its divisors is an integer number (1806971760).

Almost surely, 2^21322021431 is an apocalyptic number.

21322021431 is a deficient number, since it is larger than the sum of its proper divisors (7589526729).

21322021431 is a wasteful number, since it uses less digits than its factorization.

21322021431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284006.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21322021431 its reverse (13412022312), we get a palindrome (34734043743).

The spelling of 21322021431 in words is "twenty-one billion, three hundred twenty-two million, twenty-one thousand, four hundred thirty-one".