21240503105 has 32 divisors (see below), whose sum is σ = 26813134080. Its totient is φ = 16121825280.

The previous prime is 21240503101. The next prime is 21240503113. The reversal of 21240503105 is 50130504212.

It is not a de Polignac number, because 21240503105 - 2² = 21240503101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21240503101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14264201 + ... + 14265689.

It is an arithmetic number, because the mean of its divisors is an integer number (837910440).

Almost surely, 2^21240503105 is an apocalyptic number.

It is an amenable number.

21240503105 is a deficient number, since it is larger than the sum of its proper divisors (5572630975).

21240503105 is a wasteful number, since it uses less digits than its factorization.

21240503105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441.

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 21240503105 in words is "twenty-one billion, two hundred forty million, five hundred three thousand, one hundred five".