21383081761 has 16 divisors (see below), whose sum is σ = 23179373568. Its totient is φ = 19667419200.

The previous prime is 21383081749. The next prime is 21383081767. The reversal of 21383081761 is 16718038312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21383081761 is a prime.

It is a super-2 number, since 2×21383081761² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21383081767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16431 + ... + 207451.

It is an arithmetic number, because the mean of its divisors is an integer number (1448710848).

Almost surely, 2^21383081761 is an apocalyptic number.

It is an amenable number.

21383081761 is a deficient number, since it is larger than the sum of its proper divisors (1796291807).

21383081761 is a wasteful number, since it uses less digits than its factorization.

21383081761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191232.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 21383081761 in words is "twenty-one billion, three hundred eighty-three million, eighty-one thousand, seven hundred sixty-one".