221210021122001 has 4 divisors (see below), whose sum is σ = 221210265188352. Its totient is φ = 221209777055652.

The previous prime is 221210021121961. The next prime is 221210021122003. The reversal of 221210021122001 is 100221120012122.

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 221210021122001 - 2¹⁸ = 221210020859857 is a prime.

It is a super-2 number, since 2×221210021122001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210021122003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120668561 + ... + 122488046.

It is an arithmetic number, because the mean of its divisors is an integer number (55302566297088).

Almost surely, 2^{221210021122001} is an apocalyptic number.

It is an amenable number.

221210021122001 is a deficient number, since it is larger than the sum of its proper divisors (244066351).

221210021122001 is an equidigital number, since it uses as much as digits as its factorization.

221210021122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244066350.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221210021122001 its reverse (100221120012122), we get a palindrome (321431141134123).

The spelling of 221210021122001 in words is "two hundred twenty-one trillion, two hundred ten billion, twenty-one million, one hundred twenty-two thousand, one".