172220002112021 has 4 divisors (see below), whose sum is σ = 172220180564544. Its totient is φ = 172219823659500.

The previous prime is 172220002111991. The next prime is 172220002112057. The reversal of 172220002112021 is 120211200022271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172220002112021 - 2¹⁴ = 172220002095637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172220008112021) 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 3 ways as a sum of consecutive naturals, for example, 87770735 + ... + 89711436.

It is an arithmetic number, because the mean of its divisors is an integer number (43055045141136).

Almost surely, 2^{172220002112021} is an apocalyptic number.

It is an amenable number.

172220002112021 is a deficient number, since it is larger than the sum of its proper divisors (178452523).

172220002112021 is an equidigital number, since it uses as much as digits as its factorization.

172220002112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178452522.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 172220002112021 its reverse (120211200022271), we get a palindrome (292431202134292).

The spelling of 172220002112021 in words is "one hundred seventy-two trillion, two hundred twenty billion, two million, one hundred twelve thousand, twenty-one".