213122031220 has 96 divisors (see below), whose sum is σ = 516084387840. Its totient is φ = 72417421440.

The previous prime is 213122031217. The next prime is 213122031259. The reversal of 213122031220 is 22130221312.

It is a congruent number.

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, 7044967 + ... + 7075153.

It is an arithmetic number, because the mean of its divisors is an integer number (5375879040).

Almost surely, 2^213122031220 is an apocalyptic number.

213122031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213122031220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258042193920).

213122031220 is an abundant number, since it is smaller than the sum of its proper divisors (302962356620).

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

213122031220 is a wasteful number, since it uses less digits than its factorization.

213122031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30653 (or 30651 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 213122031220 its reverse (22130221312), we get a palindrome (235252252532).

The spelling of 213122031220 in words is "two hundred thirteen billion, one hundred twenty-two million, thirty-one thousand, two hundred twenty".