21002101210 has 16 divisors (see below), whose sum is σ = 37954399392. Its totient is φ = 8367370000.

The previous prime is 21002101181. The next prime is 21002101249. The reversal of 21002101210 is 1210120012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4181176 + ... + 4186195.

It is an arithmetic number, because the mean of its divisors is an integer number (2372149962).

Almost surely, 2^21002101210 is an apocalyptic number.

21002101210 is a deficient number, since it is larger than the sum of its proper divisors (16952298182).

21002101210 is a wasteful number, since it uses less digits than its factorization.

21002101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8367629.

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

Adding to 21002101210 its reverse (1210120012), we get a palindrome (22212221222).

The spelling of 21002101210 in words is "twenty-one billion, two million, one hundred one thousand, two hundred ten".