21303868051 has 4 divisors (see below), whose sum is σ = 21434566792. Its totient is φ = 21173169312.

The previous prime is 21303867983. The next prime is 21303868093. The reversal of 21303868051 is 15086830312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21303868051 - 2³³ = 12713933459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21303868051.

It is not an unprimeable number, because it can be changed into a prime (21303860051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65349126 + ... + 65349451.

It is an arithmetic number, because the mean of its divisors is an integer number (5358641698).

Almost surely, 2^21303868051 is an apocalyptic number.

21303868051 is a deficient number, since it is larger than the sum of its proper divisors (130698741).

21303868051 is a wasteful number, since it uses less digits than its factorization.

21303868051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130698740.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 21303868051 in words is "twenty-one billion, three hundred three million, eight hundred sixty-eight thousand, fifty-one".