212221221120021 has 16 divisors (see below), whose sum is σ = 285466448703744. Its totient is φ = 140228410258944.

The previous prime is 212221221119993. The next prime is 212221221120049. The reversal of 212221221120021 is 120021122122212.

It is an interprime number because it is at equal distance from previous prime (212221221119993) and next prime (212221221120049).

It is not a de Polignac number, because 212221221120021 - 2¹⁰ = 212221221118997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212221221120021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221221120071) 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, 220241140 + ... + 221202626.

It is an arithmetic number, because the mean of its divisors is an integer number (17841653043984).

Almost surely, 2^{212221221120021} is an apocalyptic number.

It is an amenable number.

212221221120021 is a deficient number, since it is larger than the sum of its proper divisors (73245227583723).

212221221120021 is a wasteful number, since it uses less digits than its factorization.

212221221120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612700.

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

Adding to 212221221120021 its reverse (120021122122212), we get a palindrome (332242343242233).

The spelling of 212221221120021 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, twenty-one".