21210021201021 has 16 divisors (see below), whose sum is σ = 30461517127680. Its totient is φ = 13088933138160.

The previous prime is 21210021200971. The next prime is 21210021201041. The reversal of 21210021201021 is 12010212001212.

It is not a de Polignac number, because 21210021201021 - 2¹⁵ = 21210021168253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210021201041) 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, 4957927081 + ... + 4957931358.

It is an arithmetic number, because the mean of its divisors is an integer number (1903844820480).

Almost surely, 2^{21210021201021} is an apocalyptic number.

It is an amenable number.

21210021201021 is a deficient number, since it is larger than the sum of its proper divisors (9251495926659).

21210021201021 is a wasteful number, since it uses less digits than its factorization.

21210021201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9915858496.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210021201021 its reverse (12010212001212), we get a palindrome (33220233202233).

The spelling of 21210021201021 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, two hundred one thousand, twenty-one".