21091950212 has 12 divisors (see below), whose sum is σ = 38183703180. Its totient is φ = 10182320736.

The previous prime is 21091950203. The next prime is 21091950223. The reversal of 21091950212 is 21205919012.

It can be written as a sum of positive squares in 2 ways, for example, as 6294200896 + 14797749316 = 79336^2 + 121646^2 .

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 3 ways as a sum of consecutive naturals, for example, 90913463 + ... + 90913694.

It is an arithmetic number, because the mean of its divisors is an integer number (3181975265).

Almost surely, 2^21091950212 is an apocalyptic number.

It is an amenable number.

21091950212 is a deficient number, since it is larger than the sum of its proper divisors (17091752968).

21091950212 is a wasteful number, since it uses less digits than its factorization.

21091950212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181827190 (or 181827188 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 32.

The spelling of 21091950212 in words is "twenty-one billion, ninety-one million, nine hundred fifty thousand, two hundred twelve".