2100420220 has 24 divisors (see below), whose sum is σ = 4440492000. Its totient is φ = 834528192.

The previous prime is 2100420209. The next prime is 2100420229. The reversal of 2100420220 is 220240012.

It is a self number, because there is not a number n which added to its sum of digits gives 2100420220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100420229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349440 + ... + 355399.

It is an arithmetic number, because the mean of its divisors is an integer number (185020500).

Almost surely, 2^2100420220 is an apocalyptic number.

2100420220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100420220 is an abundant number, since it is smaller than the sum of its proper divisors (2340071780).

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

2100420220 is a wasteful number, since it uses less digits than its factorization.

2100420220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704997 (or 704995 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2100420220 is about 45830.3416963042. The cubic root of 2100420220 is about 1280.6645759537.

Adding to 2100420220 its reverse (220240012), we get a palindrome (2320660232).

The spelling of 2100420220 in words is "two billion, one hundred million, four hundred twenty thousand, two hundred twenty".