212322310221 has 16 divisors (see below), whose sum is σ = 325215131264. Its totient is φ = 120698394624.

The previous prime is 212322310219. The next prime is 212322310267. The reversal of 212322310221 is 122013223212.

It is not a de Polignac number, because 212322310221 - 2¹ = 212322310219 is a prime.

It is a super-2 number, since 2×212322310221² (a number of 23 digits) contains 22 as substring.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212322310121) 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, 26189176 + ... + 26197281.

It is an arithmetic number, because the mean of its divisors is an integer number (20325945704).

Almost surely, 2^212322310221 is an apocalyptic number.

212322310221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212322310221 is a deficient number, since it is larger than the sum of its proper divisors (112892821043).

212322310221 is a wasteful number, since it uses less digits than its factorization.

212322310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52386660.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 212322310221 its reverse (122013223212), we get a palindrome (334335533433).

The spelling of 212322310221 in words is "two hundred twelve billion, three hundred twenty-two million, three hundred ten thousand, two hundred twenty-one".