212312310 has 128 divisors (see below), whose sum is σ = 614615040. Its totient is φ = 45889536.

The previous prime is 212312299. The next prime is 212312341. The reversal of 212312310 is 13213212.

It is a super-2 number, since 2×212312310² = 90153033955072200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 212312310.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 545596 + ... + 545984.

It is an arithmetic number, because the mean of its divisors is an integer number (4801680).

Almost surely, 2^212312310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212312310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307307520).

212312310 is an abundant number, since it is smaller than the sum of its proper divisors (402302730).

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

212312310 is a wasteful number, since it uses less digits than its factorization.

212312310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 212312310 is about 14570.9406010731. The cubic root of 212312310 is about 596.5658541259.

Adding to 212312310 its reverse (13213212), we get a palindrome (225525522).

The spelling of 212312310 in words is "two hundred twelve million, three hundred twelve thousand, three hundred ten".