2100010121020 has 24 divisors (see below), whose sum is σ = 5040024290784. Its totient is φ = 720003470016.

The previous prime is 2100010121017. The next prime is 2100010121021. The reversal of 2100010121020 is 201210100012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2100010120988 and 2100010121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100010121021) 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, 7500036007 + ... + 7500036286.

It is an arithmetic number, because the mean of its divisors is an integer number (210001012116).

Almost surely, 2^{2100010121020} is an apocalyptic number.

2100010121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100010121020 is an abundant number, since it is smaller than the sum of its proper divisors (2940014169764).

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

2100010121020 is a wasteful number, since it uses less digits than its factorization.

2100010121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15000072309 (or 15000072307 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2100010121020 its reverse (201210100012), we get a palindrome (2301220221032).

The spelling of 2100010121020 in words is "two trillion, one hundred billion, ten million, one hundred twenty-one thousand, twenty".