213111031220 has 96 divisors (see below), whose sum is σ = 470420213760. Its totient is φ = 81026225280.

The previous prime is 213111031169. The next prime is 213111031223. The reversal of 213111031220 is 22130111312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213111031223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4447751 + ... + 4495409.

It is an arithmetic number, because the mean of its divisors is an integer number (4900210560).

Almost surely, 2^213111031220 is an apocalyptic number.

213111031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213111031220 is an abundant number, since it is smaller than the sum of its proper divisors (257309182540).

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

213111031220 is a wasteful number, since it uses less digits than its factorization.

213111031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47853 (or 47851 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 213111031220 its reverse (22130111312), we get a palindrome (235241142532).

The spelling of 213111031220 in words is "two hundred thirteen billion, one hundred eleven million, thirty-one thousand, two hundred twenty".