2100000012020 has 24 divisors (see below), whose sum is σ = 4455463947144. Its totient is φ = 831340210176.

The previous prime is 2100000011971. The next prime is 2100000012023. The reversal of 2100000012020 is 202100000012.

It can be written as a sum of positive squares in 4 ways, for example, as 19268771344 + 2080731240676 = 138812^2 + 1442474^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2100000011989 and 2100000012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100000012023) 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, 541235177 + ... + 541239056.

It is an arithmetic number, because the mean of its divisors is an integer number (185644331131).

Almost surely, 2^{2100000012020} is an apocalyptic number.

2100000012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100000012020 is an abundant number, since it is smaller than the sum of its proper divisors (2355463935124).

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

2100000012020 is a wasteful number, since it uses less digits than its factorization.

2100000012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082474339 (or 1082474337 counting only the distinct ones).

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

Adding to 2100000012020 its reverse (202100000012), we get a palindrome (2302100012032).

The spelling of 2100000012020 in words is "two trillion, one hundred billion, twelve thousand, twenty".