21641764383 has 16 divisors (see below), whose sum is σ = 32076851040. Its totient is φ = 14421102912.

The previous prime is 21641764369. The next prime is 21641764457. The reversal of 21641764383 is 38346714612.

It is not a de Polignac number, because 21641764383 - 2⁸ = 21641764127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21641764483) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 128016 + ... + 244277.

It is an arithmetic number, because the mean of its divisors is an integer number (2004803190).

Almost surely, 2^21641764383 is an apocalyptic number.

21641764383 is a deficient number, since it is larger than the sum of its proper divisors (10435086657).

21641764383 is a wasteful number, since it uses less digits than its factorization.

21641764383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374455 (or 374449 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The spelling of 21641764383 in words is "twenty-one billion, six hundred forty-one million, seven hundred sixty-four thousand, three hundred eighty-three".