212100012122021 has 16 divisors (see below), whose sum is σ = 221365888450560. Its totient is φ = 202964444417280.

The previous prime is 212100012121969. The next prime is 212100012122027. The reversal of 212100012122021 is 120221210001212.

212100012122021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212100012122021 is a prime.

It is a super-2 number, since 2×212100012122021² (a number of 29 digits) contains 22 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 (212100012122027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68960336 + ... + 71970326.

It is an arithmetic number, because the mean of its divisors is an integer number (13835368028160).

Almost surely, 2^{212100012122021} is an apocalyptic number.

It is an amenable number.

212100012122021 is a deficient number, since it is larger than the sum of its proper divisors (9265876328539).

212100012122021 is a wasteful number, since it uses less digits than its factorization.

212100012122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031636.

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

Adding to 212100012122021 its reverse (120221210001212), we get a palindrome (332321222123233).

The spelling of 212100012122021 in words is "two hundred twelve trillion, one hundred billion, twelve million, one hundred twenty-two thousand, twenty-one".