213122231212 has 24 divisors (see below), whose sum is σ = 430803228240. Its totient is φ = 91175285760.

The previous prime is 213122231197. The next prime is 213122231219. The reversal of 213122231212 is 212132221312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (213122231219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142460637 + ... + 142462132.

It is an arithmetic number, because the mean of its divisors is an integer number (17950134510).

Almost surely, 2^213122231212 is an apocalyptic number.

213122231212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

213122231212 is an abundant number, since it is smaller than the sum of its proper divisors (217680997028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213122231212 is a wasteful number, since it uses less digits than its factorization.

213122231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284922801 (or 284922799 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

Adding to 213122231212 its reverse (212132221312), we get a palindrome (425254452524).

The spelling of 213122231212 in words is "two hundred thirteen billion, one hundred twenty-two million, two hundred thirty-one thousand, two hundred twelve".