221020220031 has 128 divisors (see below), whose sum is σ = 340282736640. Its totient is φ = 126689246208.

The previous prime is 221020219961. The next prime is 221020220041. The reversal of 221020220031 is 130022020122.

It is a happy number.

It is not a de Polignac number, because 221020220031 - 2¹⁸ = 221019957887 is a prime.

It is a super-2 number, since 2×221020220031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020220041) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 615655030 + ... + 615655388.

It is an arithmetic number, because the mean of its divisors is an integer number (2658458880).

Almost surely, 2^221020220031 is an apocalyptic number.

221020220031 is a deficient number, since it is larger than the sum of its proper divisors (119262516609).

221020220031 is a wasteful number, since it uses less digits than its factorization.

221020220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 221020220031 its reverse (130022020122), we get a palindrome (351042240153).

The spelling of 221020220031 in words is "two hundred twenty-one billion, twenty million, two hundred twenty thousand, thirty-one".