213122201220 has 96 divisors (see below), whose sum is σ = 663222954240. Its totient is φ = 56817492480.

The previous prime is 213122201219. The next prime is 213122201231. The reversal of 213122201220 is 22102221312.

213122201220 is a `hidden beast` number, since 213 + 12 + 220 + 1 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 213122201193 and 213122201202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2061484 + ... + 2162396.

It is an arithmetic number, because the mean of its divisors is an integer number (6908572440).

Almost surely, 2^213122201220 is an apocalyptic number.

213122201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213122201220 is an abundant number, since it is smaller than the sum of its proper divisors (450100753020).

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

213122201220 is a wasteful number, since it uses less digits than its factorization.

213122201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104842 (or 104834 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 213122201220 its reverse (22102221312), we get a palindrome (235224422532).

The spelling of 213122201220 in words is "two hundred thirteen billion, one hundred twenty-two million, two hundred one thousand, two hundred twenty".