21120220200021 has 8 divisors (see below), whose sum is σ = 28164638679744. Its totient is φ = 14077974260160.

The previous prime is 21120220200019. The next prime is 21120220200059. The reversal of 21120220200021 is 12000202202112.

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

It is not a de Polignac number, because 21120220200021 - 2¹ = 21120220200019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120220200061) 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, 543112281 + ... + 543151166.

It is an arithmetic number, because the mean of its divisors is an integer number (3520579834968).

Almost surely, 2^{21120220200021} is an apocalyptic number.

It is an amenable number.

21120220200021 is a deficient number, since it is larger than the sum of its proper divisors (7044418479723).

21120220200021 is a wasteful number, since it uses less digits than its factorization.

21120220200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086269931.

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

Adding to 21120220200021 its reverse (12000202202112), we get a palindrome (33120422402133).

The spelling of 21120220200021 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, two hundred thousand, twenty-one".