21002020010 has 32 divisors (see below), whose sum is σ = 39316983552. Its totient is φ = 8070914880.

The previous prime is 21002019959. The next prime is 21002020043. The reversal of 21002020010 is 1002020012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002020010.

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 15 ways as a sum of consecutive naturals, for example, 374114 + ... + 426573.

It is an arithmetic number, because the mean of its divisors is an integer number (1228655736).

Almost surely, 2^21002020010 is an apocalyptic number.

21002020010 is a deficient number, since it is larger than the sum of its proper divisors (18314963542).

21002020010 is a wasteful number, since it uses less digits than its factorization.

21002020010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800798.

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

Adding to 21002020010 its reverse (1002020012), we get a palindrome (22004040022).

The spelling of 21002020010 in words is "twenty-one billion, two million, twenty thousand, ten".