21302105351 has 4 divisors (see below), whose sum is σ = 21469838592. Its totient is φ = 21134372112.

The previous prime is 21302105333. The next prime is 21302105467. The reversal of 21302105351 is 15350120312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302105351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302105651) 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, 83866430 + ... + 83866683.

It is an arithmetic number, because the mean of its divisors is an integer number (5367459648).

Almost surely, 2^21302105351 is an apocalyptic number.

21302105351 is a deficient number, since it is larger than the sum of its proper divisors (167733241).

21302105351 is a wasteful number, since it uses less digits than its factorization.

21302105351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167733240.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21302105351 its reverse (15350120312), we get a palindrome (36652225663).

The spelling of 21302105351 in words is "twenty-one billion, three hundred two million, one hundred five thousand, three hundred fifty-one".