21073580494 has 16 divisors (see below), whose sum is σ = 33493238208. Its totient is φ = 9910035712.

The previous prime is 21073580449. The next prime is 21073580497. The reversal of 21073580494 is 49408537012.

It is a self number, because there is not a number n which added to its sum of digits gives 21073580494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073580497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167542 + ... + 264985.

It is an arithmetic number, because the mean of its divisors is an integer number (2093327388).

Almost surely, 2^21073580494 is an apocalyptic number.

21073580494 is a deficient number, since it is larger than the sum of its proper divisors (12419657714).

21073580494 is a wasteful number, since it uses less digits than its factorization.

21073580494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433979.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 21073580494 in words is "twenty-one billion, seventy-three million, five hundred eighty thousand, four hundred ninety-four".