221122202112021 has 16 divisors (see below), whose sum is σ = 339372204684800. Its totient is φ = 125446511371248.

The previous prime is 221122202111981. The next prime is 221122202112059. The reversal of 221122202112021 is 120211202221122.

It is not a de Polignac number, because 221122202112021 - 2⁹ = 221122202111509 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122202112121) 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, 37876359211 + ... + 37876365048.

It is an arithmetic number, because the mean of its divisors is an integer number (21210762792800).

Almost surely, 2^{221122202112021} is an apocalyptic number.

221122202112021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221122202112021 is a deficient number, since it is larger than the sum of its proper divisors (118250002572779).

221122202112021 is a wasteful number, since it uses less digits than its factorization.

221122202112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75752724408.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221122202112021 its reverse (120211202221122), we get a palindrome (341333404333143).

The spelling of 221122202112021 in words is "two hundred twenty-one trillion, one hundred twenty-two billion, two hundred two million, one hundred twelve thousand, twenty-one".