213122110020 has 96 divisors (see below), whose sum is σ = 610827571200. Its totient is φ = 55491972480.

The previous prime is 213122109971. The next prime is 213122110049. The reversal of 213122110020 is 20011221312.

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

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, 8581581 + ... + 8606379.

It is an arithmetic number, because the mean of its divisors is an integer number (6362787200).

Almost surely, 2^213122110020 is an apocalyptic number.

213122110020 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 213122110020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305413785600).

213122110020 is an abundant number, since it is smaller than the sum of its proper divisors (397705461180).

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

213122110020 is a wasteful number, since it uses less digits than its factorization.

213122110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28185 (or 28183 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 213122110020 its reverse (20011221312), we get a palindrome (233133331332).

The spelling of 213122110020 in words is "two hundred thirteen billion, one hundred twenty-two million, one hundred ten thousand, twenty".