221010010021 has 8 divisors (see below), whose sum is σ = 223231284000. Its totient is φ = 218789384400.

The previous prime is 221010010019. The next prime is 221010010043. The reversal of 221010010021 is 120010010122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221010010021 - 2¹ = 221010010019 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 (221010010121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538210 + ... + 855388.

It is an arithmetic number, because the mean of its divisors is an integer number (27903910500).

Almost surely, 2^221010010021 is an apocalyptic number.

It is an amenable number.

221010010021 is a deficient number, since it is larger than the sum of its proper divisors (2221273979).

221010010021 is a wasteful number, since it uses less digits than its factorization.

221010010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324179.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221010010021 its reverse (120010010122), we get a palindrome (341020020143).

The spelling of 221010010021 in words is "two hundred twenty-one billion, ten million, ten thousand, twenty-one".