2101100220 has 72 divisors (see below), whose sum is σ = 6508966464. Its totient is φ = 548370048.

The previous prime is 2101100213. The next prime is 2101100233. The reversal of 2101100220 is 220011012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115719 + ... + 132638.

It is an arithmetic number, because the mean of its divisors is an integer number (90402312).

Almost surely, 2^2101100220 is an apocalyptic number.

2101100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101100220 is an abundant number, since it is smaller than the sum of its proper divisors (4407866244).

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

2101100220 is a wasteful number, since it uses less digits than its factorization.

2101100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248419 (or 248414 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2101100220 is about 45837.7597620128. The cubic root of 2101100220 is about 1280.8027638493.

Adding to 2101100220 its reverse (220011012), we get a palindrome (2321111232).

The spelling of 2101100220 in words is "two billion, one hundred one million, one hundred thousand, two hundred twenty".