21002102102 has 8 divisors (see below), whose sum is σ = 32872855536. Its totient is φ = 10044483592.

The previous prime is 21002102071. The next prime is 21002102111. The reversal of 21002102102 is 20120120012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228283673 + ... + 228283764.

It is an arithmetic number, because the mean of its divisors is an integer number (4109106942).

Almost surely, 2^21002102102 is an apocalyptic number.

21002102102 is a deficient number, since it is larger than the sum of its proper divisors (11870753434).

21002102102 is a wasteful number, since it uses less digits than its factorization.

21002102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456567462.

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

Adding to 21002102102 its reverse (20120120012), we get a palindrome (41122222114).

The spelling of 21002102102 in words is "twenty-one billion, two million, one hundred two thousand, one hundred two".