21022331331 has 16 divisors (see below), whose sum is σ = 28086119424. Its totient is φ = 13986743904.

The previous prime is 21022331311. The next prime is 21022331347. The reversal of 21022331331 is 13313322012.

It is not a de Polignac number, because 21022331331 - 2⁷ = 21022331203 is a prime.

It is a super-2 number, since 2×21022331331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022331298 and 21022331307.

It is not an unprimeable number, because it can be changed into a prime (21022331311) 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, 5091790 + ... + 5095916.

It is an arithmetic number, because the mean of its divisors is an integer number (1755382464).

Almost surely, 2^21022331331 is an apocalyptic number.

21022331331 is a deficient number, since it is larger than the sum of its proper divisors (7063788093).

21022331331 is a wasteful number, since it uses less digits than its factorization.

21022331331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7130.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21022331331 its reverse (13313322012), we get a palindrome (34335653343).

The spelling of 21022331331 in words is "twenty-one billion, twenty-two million, three hundred thirty-one thousand, three hundred thirty-one".