21291199083 has 192 divisors, whose sum is σ = 41096471040. Its totient is φ = 10860030720.

The previous prime is 21291199057. The next prime is 21291199123. The reversal of 21291199083 is 38099119212.

It is not a de Polignac number, because 21291199083 - 2⁸ = 21291198827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21291199283) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 188417635 + ... + 188417747.

It is an arithmetic number, because the mean of its divisors is an integer number (214044120).

Almost surely, 2^21291199083 is an apocalyptic number.

21291199083 is a deficient number, since it is larger than the sum of its proper divisors (19805271957).

21291199083 is a wasteful number, since it uses less digits than its factorization.

21291199083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The spelling of 21291199083 in words is "twenty-one billion, two hundred ninety-one million, one hundred ninety-nine thousand, eighty-three".