21766042046 has 16 divisors (see below), whose sum is σ = 38599878240. Its totient is φ = 9006637920.

The previous prime is 21766041949. The next prime is 21766042057. The reversal of 21766042046 is 64024066712.

It is a super-2 number, since 2×21766042046² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26805065 + ... + 26805876.

It is an arithmetic number, because the mean of its divisors is an integer number (2412492390).

Almost surely, 2^21766042046 is an apocalyptic number.

21766042046 is a deficient number, since it is larger than the sum of its proper divisors (16833836194).

21766042046 is a wasteful number, since it uses less digits than its factorization.

21766042046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53610979.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 21766042046 in words is "twenty-one billion, seven hundred sixty-six million, forty-two thousand, forty-six".