222121110010021 has 4 divisors (see below), whose sum is σ = 226847091074112. Its totient is φ = 217395128945932.

The previous prime is 222121110009977. The next prime is 222121110010027. The reversal of 222121110010021 is 120010011121222.

222121110010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 222121110010021 - 2²⁵ = 222121076455589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222121110009977 and 222121110010004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121110010027) 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, 2362990531975 + ... + 2362990532068.

It is an arithmetic number, because the mean of its divisors is an integer number (56711772768528).

Almost surely, 2^{222121110010021} is an apocalyptic number.

It is an amenable number.

222121110010021 is a deficient number, since it is larger than the sum of its proper divisors (4725981064091).

222121110010021 is an equidigital number, since it uses as much as digits as its factorization.

222121110010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4725981064090.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 222121110010021 its reverse (120010011121222), we get a palindrome (342131121131243).

The spelling of 222121110010021 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred ten million, ten thousand, twenty-one".