21746855366 has 4 divisors (see below), whose sum is σ = 32620283052. Its totient is φ = 10873427682.

The previous prime is 21746855329. The next prime is 21746855411. The reversal of 21746855366 is 66355864712.

It is a happy number.

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, 5436713840 + ... + 5436713843.

It is an arithmetic number, because the mean of its divisors is an integer number (8155070763).

Almost surely, 2^21746855366 is an apocalyptic number.

21746855366 is a deficient number, since it is larger than the sum of its proper divisors (10873427686).

21746855366 is a wasteful number, since it uses less digits than its factorization.

21746855366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10873427685.

The product of its digits is 7257600, while the sum is 53.

The spelling of 21746855366 in words is "twenty-one billion, seven hundred forty-six million, eight hundred fifty-five thousand, three hundred sixty-six".