21220333131 has 16 divisors (see below), whose sum is σ = 28371340800. Its totient is φ = 14108162208.

The previous prime is 21220333109. The next prime is 21220333133. The reversal of 21220333131 is 13133302212.

It is not a de Polignac number, because 21220333131 - 2⁹ = 21220332619 is a prime.

It is a super-2 number, since 2×21220333131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220333098 and 21220333107.

It is not an unprimeable number, because it can be changed into a prime (21220333133) 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 15 ways as a sum of consecutive naturals, for example, 1727710 + ... + 1739948.

It is an arithmetic number, because the mean of its divisors is an integer number (1773208800).

Almost surely, 2^21220333131 is an apocalyptic number.

21220333131 is a deficient number, since it is larger than the sum of its proper divisors (7151007669).

21220333131 is a wasteful number, since it uses less digits than its factorization.

21220333131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13778.

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

Adding to 21220333131 its reverse (13133302212), we get a palindrome (34353635343).

The spelling of 21220333131 in words is "twenty-one billion, two hundred twenty million, three hundred thirty-three thousand, one hundred thirty-one".