21221402331 has 8 divisors (see below), whose sum is σ = 28485104400. Its totient is φ = 14052650912.

The previous prime is 21221402327. The next prime is 21221402333. The reversal of 21221402331 is 13320412212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221402331 - 2² = 21221402327 is a prime.

It is a super-2 number, since 2×21221402331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221402298 and 21221402307.

It is not an unprimeable number, because it can be changed into a prime (21221402333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23737140 + ... + 23738033.

It is an arithmetic number, because the mean of its divisors is an integer number (3560638050).

Almost surely, 2^21221402331 is an apocalyptic number.

21221402331 is a deficient number, since it is larger than the sum of its proper divisors (7263702069).

21221402331 is a wasteful number, since it uses less digits than its factorization.

21221402331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47475325.

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

Adding to 21221402331 its reverse (13320412212), we get a palindrome (34541814543).

The spelling of 21221402331 in words is "twenty-one billion, two hundred twenty-one million, four hundred two thousand, three hundred thirty-one".