21891327733 has 8 divisors (see below), whose sum is σ = 23882916960. Its totient is φ = 19899983280.

The previous prime is 21891327613. The next prime is 21891327751. The reversal of 21891327733 is 33772319812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21891327733 - 2⁹ = 21891327221 is a prime.

It is a super-2 number, since 2×21891327733² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21891327763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160866 + ... + 263932.

It is an arithmetic number, because the mean of its divisors is an integer number (2985364620).

Almost surely, 2^21891327733 is an apocalyptic number.

It is an amenable number.

21891327733 is a deficient number, since it is larger than the sum of its proper divisors (1991589227).

21891327733 is a wasteful number, since it uses less digits than its factorization.

21891327733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122387.

The product of its digits is 381024, while the sum is 46.

The spelling of 21891327733 in words is "twenty-one billion, eight hundred ninety-one million, three hundred twenty-seven thousand, seven hundred thirty-three".