21199900210 has 8 divisors (see below), whose sum is σ = 38159820396. Its totient is φ = 8479960080.

The previous prime is 21199900181. The next prime is 21199900223. The reversal of 21199900210 is 1200999112.

It can be written as a sum of positive squares in 2 ways, for example, as 19969363969 + 1230536241 = 141313^2 + 35079^2 .

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

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, 1059995001 + ... + 1059995020.

Almost surely, 2^21199900210 is an apocalyptic number.

21199900210 is a deficient number, since it is larger than the sum of its proper divisors (16959920186).

21199900210 is a wasteful number, since it uses less digits than its factorization.

21199900210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119990028.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 21199900210 in words is "twenty-one billion, one hundred ninety-nine million, nine hundred thousand, two hundred ten".