21020100010 has 48 divisors (see below), whose sum is σ = 46823498496. Its totient is φ = 6652511424.

The previous prime is 21020099987. The next prime is 21020100043. The reversal of 21020100010 is 1000102012.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 21020099966 and 21020100002.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 876594 + ... + 900253.

It is an arithmetic number, because the mean of its divisors is an integer number (975489552).

Almost surely, 2^21020100010 is an apocalyptic number.

21020100010 is an abundant number, since it is smaller than the sum of its proper divisors (25803398486).

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

21020100010 is a wasteful number, since it uses less digits than its factorization.

21020100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776887 (or 1776874 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21020100010 its reverse (1000102012), we get a palindrome (22020202022).

The spelling of 21020100010 in words is "twenty-one billion, twenty million, one hundred thousand, ten".