212313001221 has 48 divisors (see below), whose sum is σ = 323746954752. Its totient is φ = 133902720000.

The previous prime is 212313001211. The next prime is 212313001259. The reversal of 212313001221 is 122100313212.

212313001221 is a `hidden beast` number, since 212 + 31 + 300 + 122 + 1 = 666.

It is not a de Polignac number, because 212313001221 - 2⁵ = 212313001189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212313001194 and 212313001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212313001211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2255346 + ... + 2347596.

It is an arithmetic number, because the mean of its divisors is an integer number (6744728224).

Almost surely, 2^212313001221 is an apocalyptic number.

It is an amenable number.

212313001221 is a deficient number, since it is larger than the sum of its proper divisors (111433953531).

212313001221 is a wasteful number, since it uses less digits than its factorization.

212313001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92474 (or 92471 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 212313001221 its reverse (122100313212), we get a palindrome (334413314433).

The spelling of 212313001221 in words is "two hundred twelve billion, three hundred thirteen million, one thousand, two hundred twenty-one".