221010101010021 has 16 divisors (see below), whose sum is σ = 294713764193600. Its totient is φ = 147323253392640.

The previous prime is 221010101009993. The next prime is 221010101010031. The reversal of 221010101010021 is 120010101010122.

It is not a de Polignac number, because 221010101010021 - 2¹⁷ = 221010100878949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221010101009979 and 221010101010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010101010031) 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, 1479530466 + ... + 1479679836.

It is an arithmetic number, because the mean of its divisors is an integer number (18419610262100).

Almost surely, 2^{221010101010021} is an apocalyptic number.

It is an amenable number.

221010101010021 is a deficient number, since it is larger than the sum of its proper divisors (73703663183579).

221010101010021 is a wasteful number, since it uses less digits than its factorization.

221010101010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202356.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221010101010021 its reverse (120010101010122), we get a palindrome (341020202020143).

The spelling of 221010101010021 in words is "two hundred twenty-one trillion, ten billion, one hundred one million, ten thousand, twenty-one".