21002102110 has 32 divisors (see below), whose sum is σ = 41250363264. Its totient is φ = 7635300000.

The previous prime is 21002102071. The next prime is 21002102111. The reversal of 21002102110 is 1120120012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002102111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 491085 + ... + 532135.

It is an arithmetic number, because the mean of its divisors is an integer number (1289073852).

Almost surely, 2^21002102110 is an apocalyptic number.

21002102110 is a deficient number, since it is larger than the sum of its proper divisors (20248261154).

21002102110 is a wasteful number, since it uses less digits than its factorization.

21002102110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45720.

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

Adding to 21002102110 its reverse (1120120012), we get a palindrome (22122222122).

The spelling of 21002102110 in words is "twenty-one billion, two million, one hundred two thousand, one hundred ten".