21221132331 has 32 divisors (see below), whose sum is σ = 33021964800. Its totient is φ = 11871198720.

The previous prime is 21221132327. The next prime is 21221132369. The reversal of 21221132331 is 13323112212.

It is not a de Polignac number, because 21221132331 - 2² = 21221132327 is a prime.

It is a super-2 number, since 2×21221132331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21221132298 and 21221132307.

It is not an unprimeable number, because it can be changed into a prime (21221132311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263065 + ... + 334133.

It is an arithmetic number, because the mean of its divisors is an integer number (1031936400).

Almost surely, 2^21221132331 is an apocalyptic number.

21221132331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21221132331 is a deficient number, since it is larger than the sum of its proper divisors (11800832469).

21221132331 is a wasteful number, since it uses less digits than its factorization.

21221132331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71379.

The product of its digits is 432, while the sum is 21.

Adding to 21221132331 its reverse (13323112212), we get a palindrome (34544244543).

The spelling of 21221132331 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-two thousand, three hundred thirty-one".