21352641763 has 8 divisors (see below), whose sum is σ = 21542039568. Its totient is φ = 21163730304.

The previous prime is 21352641697. The next prime is 21352641787. The reversal of 21352641763 is 36714625312.

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 a de Polignac number, because none of the positive numbers 2^k-21352641763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21352644763) 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, 33106 + ... + 209287.

It is an arithmetic number, because the mean of its divisors is an integer number (2692754946).

Almost surely, 2^21352641763 is an apocalyptic number.

21352641763 is a deficient number, since it is larger than the sum of its proper divisors (189397805).

21352641763 is a wasteful number, since it uses less digits than its factorization.

21352641763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243173.

The product of its digits is 181440, while the sum is 40.

The spelling of 21352641763 in words is "twenty-one billion, three hundred fifty-two million, six hundred forty-one thousand, seven hundred sixty-three".