222121120202021 has 4 divisors (see below), whose sum is σ = 222121157648544. Its totient is φ = 222121082755500.

The previous prime is 222121120202011. The next prime is 222121120202083. The reversal of 222121120202021 is 120202021121222.

222121120202021 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 222121120202021 - 2⁶ = 222121120201957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222121120201984 and 222121120202002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121120202011) 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, 7638035 + ... + 22418336.

It is an arithmetic number, because the mean of its divisors is an integer number (55530289412136).

Almost surely, 2^{222121120202021} is an apocalyptic number.

It is an amenable number.

222121120202021 is a deficient number, since it is larger than the sum of its proper divisors (37446523).

222121120202021 is an equidigital number, since it uses as much as digits as its factorization.

222121120202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37446522.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 222121120202021 its reverse (120202021121222), we get a palindrome (342323141323243).

The spelling of 222121120202021 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred twenty million, two hundred two thousand, twenty-one".