212222012121021 has 16 divisors (see below), whose sum is σ = 323546253451904. Its totient is φ = 121209597379584.

The previous prime is 212222012120903. The next prime is 212222012121071. The reversal of 212222012121021 is 120121210222212.

It is not a de Polignac number, because 212222012121021 - 2⁹ = 212222012120509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222012121071) 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, 2505116320 + ... + 2505201033.

It is an arithmetic number, because the mean of its divisors is an integer number (20221640840744).

Almost surely, 2^{212222012121021} is an apocalyptic number.

212222012121021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212222012121021 is a deficient number, since it is larger than the sum of its proper divisors (111324241330883).

212222012121021 is a wasteful number, since it uses less digits than its factorization.

212222012121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5010319380.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212222012121021 its reverse (120121210222212), we get a palindrome (332343222343233).

The spelling of 212222012121021 in words is "two hundred twelve trillion, two hundred twenty-two billion, twelve million, one hundred twenty-one thousand, twenty-one".