212320012100221 has 4 divisors (see below), whose sum is σ = 223494749579200. Its totient is φ = 201145274621244.

The previous prime is 212320012100219. The next prime is 212320012100267. The reversal of 212320012100221 is 122001210023212.

212320012100221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212320012100221 - 2¹ = 212320012100219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 11174737478959 = 212320012100221 / (2 + 1 + 2 + 3 + 2 + 0 + 0 + 1 + 2 + 1 + 0 + 0 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212320012100201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5587368739461 + ... + 5587368739498.

It is an arithmetic number, because the mean of its divisors is an integer number (55873687394800).

Almost surely, 2^{212320012100221} is an apocalyptic number.

It is an amenable number.

212320012100221 is a deficient number, since it is larger than the sum of its proper divisors (11174737478979).

212320012100221 is a wasteful number, since it uses less digits than its factorization.

212320012100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11174737478978.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 212320012100221 its reverse (122001210023212), we get a palindrome (334321222123433).

The spelling of 212320012100221 in words is "two hundred twelve trillion, three hundred twenty billion, twelve million, one hundred thousand, two hundred twenty-one".