221021220222021 has 32 divisors (see below), whose sum is σ = 312677042388480. Its totient is φ = 138480738177600.

The previous prime is 221021220222013. The next prime is 221021220222079. The reversal of 221021220222021 is 120222022120122.

It is not a de Polignac number, because 221021220222021 - 2³ = 221021220222013 is a prime.

It is a super-2 number, since 2×221021220222021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021220226021) 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, 17567871 + ... + 27398403.

It is an arithmetic number, because the mean of its divisors is an integer number (9771157574640).

Almost surely, 2^{221021220222021} is an apocalyptic number.

It is an amenable number.

221021220222021 is a deficient number, since it is larger than the sum of its proper divisors (91655822166459).

221021220222021 is a wasteful number, since it uses less digits than its factorization.

221021220222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9833697.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221021220222021 its reverse (120222022120122), we get a palindrome (341243242342143).

The spelling of 221021220222021 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, twenty-one".