2100020220020 has 24 divisors (see below), whose sum is σ = 4410075222504. Its totient is φ = 840001847936.

The previous prime is 2100020220017. The next prime is 2100020220029. The reversal of 2100020220020 is 200220200012.

It can be written as a sum of positive squares in 4 ways, for example, as 330114597136 + 1769905622884 = 574556^2 + 1330378^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2100020219983 and 2100020220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100020220029) 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, 3155942 + ... + 3762978.

It is an arithmetic number, because the mean of its divisors is an integer number (183753134271).

Almost surely, 2^{2100020220020} is an apocalyptic number.

2100020220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100020220020 is an abundant number, since it is smaller than the sum of its proper divisors (2310055002484).

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

2100020220020 is a wasteful number, since it uses less digits than its factorization.

2100020220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780019 (or 780017 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 2100020220020 its reverse (200220200012), we get a palindrome (2300240420032).

The spelling of 2100020220020 in words is "two trillion, one hundred billion, twenty million, two hundred twenty thousand, twenty".