21213362164212 has 48 divisors (see below), whose sum is σ = 55676588419200. Its totient is φ = 7071120718488.

The previous prime is 21213362164193. The next prime is 21213362164223. The reversal of 21213362164212 is 21246126331212.

It is a happy number.

21213362164212 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 3 + 6 + 2 + 1 + 642 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1212460512 + ... + 1212478007.

It is an arithmetic number, because the mean of its divisors is an integer number (1159928925400).

Almost surely, 2^{21213362164212} is an apocalyptic number.

It is an amenable number.

21213362164212 is an abundant number, since it is smaller than the sum of its proper divisors (34463226254988).

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

21213362164212 is an equidigital number, since it uses as much as digits as its factorization.

21213362164212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424938544 (or 2424938524 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

Adding to 21213362164212 its reverse (21246126331212), we get a palindrome (42459488495424).

The spelling of 21213362164212 in words is "twenty-one trillion, two hundred thirteen billion, three hundred sixty-two million, one hundred sixty-four thousand, two hundred twelve".