21120222002021 has 4 divisors (see below), whose sum is σ = 22038492523872. Its totient is φ = 20201951480172.

The previous prime is 21120222002017. The next prime is 21120222002027. The reversal of 21120222002021 is 12020022202112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21120222002021 - 2² = 21120222002017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222002027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459135260891 + ... + 459135260936.

It is an arithmetic number, because the mean of its divisors is an integer number (5509623130968).

Almost surely, 2^{21120222002021} is an apocalyptic number.

It is an amenable number.

21120222002021 is a deficient number, since it is larger than the sum of its proper divisors (918270521851).

21120222002021 is an equidigital number, since it uses as much as digits as its factorization.

21120222002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918270521850.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21120222002021 its reverse (12020022202112), we get a palindrome (33140244204133).

The spelling of 21120222002021 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, two thousand, twenty-one".