2120010021 has 12 divisors (see below), whose sum is σ = 3067289472. Its totient is φ = 1411007976.

The previous prime is 2120009971. The next prime is 2120010023. The reversal of 2120010021 is 1200100212.

It is not a de Polignac number, because 2120010021 - 2²² = 2115815717 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 = 2120009985 and 2120010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120010023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188571 + ... + 199496.

It is an arithmetic number, because the mean of its divisors is an integer number (255607456).

Almost surely, 2^2120010021 is an apocalyptic number.

It is an amenable number.

2120010021 is a deficient number, since it is larger than the sum of its proper divisors (947279451).

2120010021 is a wasteful number, since it uses less digits than its factorization.

2120010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388680 (or 388677 counting only the distinct ones).

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

The square root of 2120010021 is about 46043.5665538629. The cubic root of 2120010021 is about 1284.6336818121.

Adding to 2120010021 its reverse (1200100212), we get a palindrome (3320110233).

It can be divided in two parts, 2 and 120010021, that multiplied together give a palindrome (240020042).

The spelling of 2120010021 in words is "two billion, one hundred twenty million, ten thousand, twenty-one".