212211212211021 has 16 divisors (see below), whose sum is σ = 288287430640704. Its totient is φ = 138804576902784.

The previous prime is 212211212211007. The next prime is 212211212211067. The reversal of 212211212211021 is 120112212112212.

It is not a de Polignac number, because 212211212211021 - 2¹⁵ = 212211212178253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211212251021) 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, 168246705 + ... + 169503321.

It is an arithmetic number, because the mean of its divisors is an integer number (18017964415044).

Almost surely, 2^{212211212211021} is an apocalyptic number.

It is an amenable number.

212211212211021 is a deficient number, since it is larger than the sum of its proper divisors (76076218429683).

212211212211021 is a wasteful number, since it uses less digits than its factorization.

212211212211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318780.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212211212211021 its reverse (120112212112212), we get a palindrome (332323424323233).

The spelling of 212211212211021 in words is "two hundred twelve trillion, two hundred eleven billion, two hundred twelve million, two hundred eleven thousand, twenty-one".