212122100021021 has 4 divisors (see below), whose sum is σ = 212557669015392. Its totient is φ = 211686531026652.

The previous prime is 212122100020997. The next prime is 212122100021047. The reversal of 212122100021021 is 120120001221212.

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 a de Polignac number, because none of the positive numbers 2^k-212122100021021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122100021081) 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, 217784496455 + ... + 217784497428.

It is an arithmetic number, because the mean of its divisors is an integer number (53139417253848).

Almost surely, 2^{212122100021021} is an apocalyptic number.

It is an amenable number.

212122100021021 is a deficient number, since it is larger than the sum of its proper divisors (435568994371).

212122100021021 is an equidigital number, since it uses as much as digits as its factorization.

212122100021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435568994370.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212122100021021 its reverse (120120001221212), we get a palindrome (332242101242233).

The spelling of 212122100021021 in words is "two hundred twelve trillion, one hundred twenty-two billion, one hundred million, twenty-one thousand, twenty-one".