21202100102 has 4 divisors (see below), whose sum is σ = 31803150156. Its totient is φ = 10601050050.

The previous prime is 21202100099. The next prime is 21202100123. The reversal of 21202100102 is 20100120212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300525024 + ... + 5300525027.

It is an arithmetic number, because the mean of its divisors is an integer number (7950787539).

Almost surely, 2^21202100102 is an apocalyptic number.

21202100102 is a deficient number, since it is larger than the sum of its proper divisors (10601050054).

21202100102 is a wasteful number, since it uses less digits than its factorization.

21202100102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601050053.

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

Adding to 21202100102 its reverse (20100120212), we get a palindrome (41302220314).

The spelling of 21202100102 in words is "twenty-one billion, two hundred two million, one hundred thousand, one hundred two".