21010102102 has 8 divisors (see below), whose sum is σ = 34380167112. Its totient is φ = 9550046400.

The previous prime is 21010102097. The next prime is 21010102181. The reversal of 21010102102 is 20120101012.

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, 477502299 + ... + 477502342.

It is an arithmetic number, because the mean of its divisors is an integer number (4297520889).

Almost surely, 2^21010102102 is an apocalyptic number.

21010102102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21010102102 is a deficient number, since it is larger than the sum of its proper divisors (13370065010).

21010102102 is a wasteful number, since it uses less digits than its factorization.

21010102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955004654.

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

Adding to 21010102102 its reverse (20120101012), we get a palindrome (41130203114).

The spelling of 21010102102 in words is "twenty-one billion, ten million, one hundred two thousand, one hundred two".