2100131220 has 96 divisors (see below), whose sum is σ = 6487205760. Its totient is φ = 503388160.

The previous prime is 2100131213. The next prime is 2100131249. The reversal of 2100131220 is 221310012.

It is a super-2 number, since 2×2100131220² = 8821102282437376800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2100131196 and 2100131205.

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, 40864 + ... + 76616.

It is an arithmetic number, because the mean of its divisors is an integer number (67575060).

Almost surely, 2^2100131220 is an apocalyptic number.

2100131220 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 2100131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3243602880).

2100131220 is an abundant number, since it is smaller than the sum of its proper divisors (4387074540).

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

2100131220 is a wasteful number, since it uses less digits than its factorization.

2100131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35865 (or 35863 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2100131220 is about 45827.1886547713. The cubic root of 2100131220 is about 1280.6058370666.

Adding to 2100131220 its reverse (221310012), we get a palindrome (2321441232).

The spelling of 2100131220 in words is "two billion, one hundred million, one hundred thirty-one thousand, two hundred twenty".