21022497881 has 48 divisors (see below), whose sum is σ = 28174583808. Its totient is φ = 15479402400.

The previous prime is 21022497803. The next prime is 21022497911. The reversal of 21022497881 is 18879422012.

It is not a de Polignac number, because 21022497881 - 2³⁰ = 19948756057 is a prime.

It is a super-2 number, since 2×21022497881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21022497781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1018736 + ... + 1039166.

It is an arithmetic number, because the mean of its divisors is an integer number (586970496).

Almost surely, 2^21022497881 is an apocalyptic number.

It is an amenable number.

21022497881 is a deficient number, since it is larger than the sum of its proper divisors (7152085927).

21022497881 is a wasteful number, since it uses less digits than its factorization.

21022497881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20562 (or 20555 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 21022497881 in words is "twenty-one billion, twenty-two million, four hundred ninety-seven thousand, eight hundred eighty-one".