21298053903 has 16 divisors (see below), whose sum is σ = 32568865536. Its totient is φ = 12127308480.

The previous prime is 21298053877. The next prime is 21298053913. The reversal of 21298053903 is 30935089212.

It is not a de Polignac number, because 21298053903 - 2²⁸ = 21029618447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21298053913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1785918 + ... + 1797803.

It is an arithmetic number, because the mean of its divisors is an integer number (2035554096).

Almost surely, 2^21298053903 is an apocalyptic number.

21298053903 is a deficient number, since it is larger than the sum of its proper divisors (11270811633).

21298053903 is a wasteful number, since it uses less digits than its factorization.

21298053903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584014.

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 21298053903 in words is "twenty-one billion, two hundred ninety-eight million, fifty-three thousand, nine hundred three".