21662581294 has 4 divisors (see below), whose sum is σ = 32493871944. Its totient is φ = 10831290646.

The previous prime is 21662581289. The next prime is 21662581307. The reversal of 21662581294 is 49218526612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5415645322 + ... + 5415645325.

It is an arithmetic number, because the mean of its divisors is an integer number (8123467986).

Almost surely, 2^21662581294 is an apocalyptic number.

21662581294 is a deficient number, since it is larger than the sum of its proper divisors (10831290650).

21662581294 is a wasteful number, since it uses less digits than its factorization.

21662581294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10831290649.

The product of its digits is 414720, while the sum is 46.

The spelling of 21662581294 in words is "twenty-one billion, six hundred sixty-two million, five hundred eighty-one thousand, two hundred ninety-four".