2100010200021 has 48 divisors (see below), whose sum is σ = 3160294195968. Its totient is φ = 1342521734400.

The previous prime is 2100010200019. The next prime is 2100010200047. The reversal of 2100010200021 is 1200020100012.

It is not a de Polignac number, because 2100010200021 - 2¹ = 2100010200019 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 2100010199976 and 2100010200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100010200011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76991616 + ... + 77018886.

It is an arithmetic number, because the mean of its divisors is an integer number (65839462416).

Almost surely, 2^{2100010200021} is an apocalyptic number.

It is an amenable number.

2100010200021 is a deficient number, since it is larger than the sum of its proper divisors (1060283995947).

2100010200021 is a wasteful number, since it uses less digits than its factorization.

2100010200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30642 (or 30639 counting only the distinct ones).

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

Adding to 2100010200021 its reverse (1200020100012), we get a palindrome (3300030300033).

The spelling of 2100010200021 in words is "two trillion, one hundred billion, ten million, two hundred thousand, twenty-one".