21102021002 has 16 divisors (see below), whose sum is σ = 33034348800. Its totient is φ = 10090713072.

The previous prime is 21102020987. The next prime is 21102021019. The reversal of 21102021002 is 20012020112.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 299999 + ... + 363597.

It is an arithmetic number, because the mean of its divisors is an integer number (2064646800).

Almost surely, 2^21102021002 is an apocalyptic number.

21102021002 is a deficient number, since it is larger than the sum of its proper divisors (11932327798).

21102021002 is a wasteful number, since it uses less digits than its factorization.

21102021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70837.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21102021002 its reverse (20012020112), we get a palindrome (41114041114).

The spelling of 21102021002 in words is "twenty-one billion, one hundred two million, twenty-one thousand, two".