21031298807 has 4 divisors (see below), whose sum is σ = 21157234896. Its totient is φ = 20905362720.

The previous prime is 21031298737. The next prime is 21031298809. The reversal of 21031298807 is 70889213012.

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 21031298807 - 2¹⁶ = 21031233271 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 (21031298809) 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, 62967794 + ... + 62968127.

It is an arithmetic number, because the mean of its divisors is an integer number (5289308724).

Almost surely, 2^21031298807 is an apocalyptic number.

21031298807 is a deficient number, since it is larger than the sum of its proper divisors (125936089).

21031298807 is a wasteful number, since it uses less digits than its factorization.

21031298807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125936088.

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 21031298807 in words is "twenty-one billion, thirty-one million, two hundred ninety-eight thousand, eight hundred seven".