21191912110 has 16 divisors (see below), whose sum is σ = 39460802400. Its totient is φ = 8184462496.

The previous prime is 21191912101. The next prime is 21191912111. The reversal of 21191912110 is 1121919112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21191912111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36537490 + ... + 36538069.

It is an arithmetic number, because the mean of its divisors is an integer number (2466300150).

Almost surely, 2^21191912110 is an apocalyptic number.

21191912110 is a deficient number, since it is larger than the sum of its proper divisors (18268890290).

21191912110 is a wasteful number, since it uses less digits than its factorization.

21191912110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73075595.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 21191912110 in words is "twenty-one billion, one hundred ninety-one million, nine hundred twelve thousand, one hundred ten".