21220022010021 has 16 divisors (see below), whose sum is σ = 28415138319360. Its totient is φ = 14085794995200.

The previous prime is 21220022009987. The next prime is 21220022010029. The reversal of 21220022010021 is 12001022002212.

It is not a de Polignac number, because 21220022010021 - 2³³ = 21211432075429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220022010029) 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, 86799285 + ... + 87043413.

It is an arithmetic number, because the mean of its divisors is an integer number (1775946144960).

Almost surely, 2^{21220022010021} is an apocalyptic number.

It is an amenable number.

21220022010021 is a deficient number, since it is larger than the sum of its proper divisors (7195116309339).

21220022010021 is a wasteful number, since it uses less digits than its factorization.

21220022010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368716.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220022010021 its reverse (12001022002212), we get a palindrome (33221044012233).

The spelling of 21220022010021 in words is "twenty-one trillion, two hundred twenty billion, twenty-two million, ten thousand, twenty-one".