21437259103 has 12 divisors (see below), whose sum is σ = 23245189968. Its totient is φ = 19760906880.

The previous prime is 21437259083. The next prime is 21437259113. The reversal of 21437259103 is 30195273412.

It is a de Polignac number, because none of the positive numbers 2^k-21437259103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437259113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35623 + ... + 210103.

It is an arithmetic number, because the mean of its divisors is an integer number (1937099164).

Almost surely, 2^21437259103 is an apocalyptic number.

21437259103 is a deficient number, since it is larger than the sum of its proper divisors (1807930865).

21437259103 is a wasteful number, since it uses less digits than its factorization.

21437259103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175234 (or 175221 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 21437259103 in words is "twenty-one billion, four hundred thirty-seven million, two hundred fifty-nine thousand, one hundred three".