21002210200021 has 8 divisors (see below), whose sum is σ = 22238254425600. Its totient is φ = 19766234874048.

The previous prime is 21002210200019. The next prime is 21002210200033. The reversal of 21002210200021 is 12000201220012.

It is a happy number.

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 21002210200021 - 2¹ = 21002210200019 is a prime.

It is a super-2 number, since 2×21002210200021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002210199974 and 21002210200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002210200051) 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, 16596661 + ... + 17817226.

It is an arithmetic number, because the mean of its divisors is an integer number (2779781803200).

Almost surely, 2^{21002210200021} is an apocalyptic number.

It is an amenable number.

21002210200021 is a deficient number, since it is larger than the sum of its proper divisors (1236044225579).

21002210200021 is a wasteful number, since it uses less digits than its factorization.

21002210200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34449803.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002210200021 its reverse (12000201220012), we get a palindrome (33002411420033).

The spelling of 21002210200021 in words is "twenty-one trillion, two billion, two hundred ten million, two hundred thousand, twenty-one".