212210021111021 has 4 divisors (see below), whose sum is σ = 212466004249500. Its totient is φ = 211954037972544.

The previous prime is 212210021111017. The next prime is 212210021111041. The reversal of 212210021111021 is 120111120012212.

212210021111021 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.

It can be written as a sum of positive squares in 2 ways, for example, as 128104797718921 + 84105223392100 = 11318339^2 + 9170890^2 .

It is a cyclic number.

It is not a de Polignac number, because 212210021111021 - 2² = 212210021111017 is a prime.

It is a super-3 number, since 3×212210021111021³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210021111041) 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, 127991567996 + ... + 127991569653.

It is an arithmetic number, because the mean of its divisors is an integer number (53116501062375).

Almost surely, 2^{212210021111021} is an apocalyptic number.

It is an amenable number.

212210021111021 is a deficient number, since it is larger than the sum of its proper divisors (255983138479).

212210021111021 is an equidigital number, since it uses as much as digits as its factorization.

212210021111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255983138478.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212210021111021 its reverse (120111120012212), we get a palindrome (332321141123233).

The spelling of 212210021111021 in words is "two hundred twelve trillion, two hundred ten billion, twenty-one million, one hundred eleven thousand, twenty-one".