221210101022021 has 4 divisors (see below), whose sum is σ = 221210394473952. Its totient is φ = 221209807570092.

The previous prime is 221210101022003. The next prime is 221210101022063. The reversal of 221210101022021 is 120220101012122.

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 221210101022021 - 2¹⁴ = 221210101005637 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 (221210101022921) 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, 145592315 + ... + 147103848.

It is an arithmetic number, because the mean of its divisors is an integer number (55302598618488).

Almost surely, 2^{221210101022021} is an apocalyptic number.

It is an amenable number.

221210101022021 is a deficient number, since it is larger than the sum of its proper divisors (293451931).

221210101022021 is an equidigital number, since it uses as much as digits as its factorization.

221210101022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293451930.

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

Adding to 221210101022021 its reverse (120220101012122), we get a palindrome (341430202034143).

The spelling of 221210101022021 in words is "two hundred twenty-one trillion, two hundred ten billion, one hundred one million, twenty-two thousand, twenty-one".