21507460040743 has 4 divisors (see below), whose sum is σ = 22772604749040. Its totient is φ = 20242315332448.

The previous prime is 21507460040699. The next prime is 21507460040809. The reversal of 21507460040743 is 34704006470512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21507460040743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21507460040743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21507460049743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632572354123 + ... + 632572354156.

It is an arithmetic number, because the mean of its divisors is an integer number (5693151187260).

Almost surely, 2^{21507460040743} is an apocalyptic number.

21507460040743 is a deficient number, since it is larger than the sum of its proper divisors (1265144708297).

21507460040743 is a wasteful number, since it uses less digits than its factorization.

21507460040743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265144708296.

The product of its (nonzero) digits is 564480, while the sum is 43.

The spelling of 21507460040743 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty million, forty thousand, seven hundred forty-three".