221020021031313 has 16 divisors (see below), whose sum is σ = 336894502348800. Its totient is φ = 126258871369296.

The previous prime is 221020021031311. The next prime is 221020021031323. The reversal of 221020021031313 is 313130120020122.

It is not a de Polignac number, because 221020021031313 - 2¹ = 221020021031311 is a prime.

It is a super-2 number, since 2×221020021031313² (a number of 29 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221020021031313.

It is not an unprimeable number, because it can be changed into a prime (221020021031311) 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, 1595075145 + ... + 1595213702.

It is an arithmetic number, because the mean of its divisors is an integer number (21055906396800).

Almost surely, 2^{221020021031313} is an apocalyptic number.

It is an amenable number.

221020021031313 is a deficient number, since it is larger than the sum of its proper divisors (115874481317487).

221020021031313 is a wasteful number, since it uses less digits than its factorization.

221020021031313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190292156.

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

Adding to 221020021031313 its reverse (313130120020122), we get a palindrome (534150141051435).

The spelling of 221020021031313 in words is "two hundred twenty-one trillion, twenty billion, twenty-one million, thirty-one thousand, three hundred thirteen".