21120202201021 has 16 divisors (see below), whose sum is σ = 26944045337088. Its totient is φ = 16074572497200.

The previous prime is 21120202200947. The next prime is 21120202201027. The reversal of 21120202201021 is 12010220202112.

It is a happy number.

It is not a de Polignac number, because 21120202201021 - 2⁹ = 21120202200509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120202200986 and 21120202201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120202201027) 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, 3189395995 + ... + 3189402616.

It is an arithmetic number, because the mean of its divisors is an integer number (1684002833568).

Almost surely, 2^{21120202201021} is an apocalyptic number.

It is an amenable number.

21120202201021 is a deficient number, since it is larger than the sum of its proper divisors (5823843136067).

21120202201021 is a wasteful number, since it uses less digits than its factorization.

21120202201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6378798672.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120202201021 its reverse (12010220202112), we get a palindrome (33130422403133).

The spelling of 21120202201021 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, two hundred one thousand, twenty-one".