212122110021 has 4 divisors (see below), whose sum is σ = 282829480032. Its totient is φ = 141414740012.

The previous prime is 212122110007. The next prime is 212122110023. The reversal of 212122110021 is 120011221212.

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 212122110021 - 2²⁷ = 211987892293 is a prime.

It is a super-2 number, since 2×212122110021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122110023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35353685001 + ... + 35353685006.

It is an arithmetic number, because the mean of its divisors is an integer number (70707370008).

Almost surely, 2^212122110021 is an apocalyptic number.

It is an amenable number.

212122110021 is a deficient number, since it is larger than the sum of its proper divisors (70707370011).

212122110021 is an equidigital number, since it uses as much as digits as its factorization.

212122110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70707370010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212122110021 its reverse (120011221212), we get a palindrome (332133331233).

The spelling of 212122110021 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred ten thousand, twenty-one".