221002110021 has 16 divisors (see below), whose sum is σ = 367380131328. Its totient is φ = 114806290800.

The previous prime is 221002109953. The next prime is 221002110053. The reversal of 221002110021 is 120011200122.

It is not a de Polignac number, because 221002110021 - 2¹¹ = 221002107973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221002109979 and 221002110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002110061) 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, 478359315 + ... + 478359776.

It is an arithmetic number, because the mean of its divisors is an integer number (22961258208).

Almost surely, 2^221002110021 is an apocalyptic number.

221002110021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221002110021 is a deficient number, since it is larger than the sum of its proper divisors (146378021307).

221002110021 is a wasteful number, since it uses less digits than its factorization.

221002110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956719112.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221002110021 its reverse (120011200122), we get a palindrome (341013310143).

The spelling of 221002110021 in words is "two hundred twenty-one billion, two million, one hundred ten thousand, twenty-one".