21786367442 has 64 divisors (see below), whose sum is σ = 41778996480. Its totient is φ = 8294731776.

The previous prime is 21786367439. The next prime is 21786367453. The reversal of 21786367442 is 24476368712.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1243898 + ... + 1261290.

It is an arithmetic number, because the mean of its divisors is an integer number (652796820).

Almost surely, 2^21786367442 is an apocalyptic number.

21786367442 is a deficient number, since it is larger than the sum of its proper divisors (19992629038).

21786367442 is a wasteful number, since it uses less digits than its factorization.

21786367442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17715.

The product of its digits is 2709504, while the sum is 50.

The spelling of 21786367442 in words is "twenty-one billion, seven hundred eighty-six million, three hundred sixty-seven thousand, four hundred forty-two".