21210112020021 has 8 divisors (see below), whose sum is σ = 28357206989184. Its totient is φ = 14101545865440.

The previous prime is 21210112019989. The next prime is 21210112020067. The reversal of 21210112020021 is 12002021101212.

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

It is not a de Polignac number, because 21210112020021 - 2⁵ = 21210112019989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210112020091) 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, 9632202360 + ... + 9632204561.

It is an arithmetic number, because the mean of its divisors is an integer number (3544650873648).

Almost surely, 2^{21210112020021} is an apocalyptic number.

It is an amenable number.

21210112020021 is a deficient number, since it is larger than the sum of its proper divisors (7147094969163).

21210112020021 is a wasteful number, since it uses less digits than its factorization.

21210112020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19264407291.

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

Adding to 21210112020021 its reverse (12002021101212), we get a palindrome (33212133121233).

The spelling of 21210112020021 in words is "twenty-one trillion, two hundred ten billion, one hundred twelve million, twenty thousand, twenty-one".