21245568007 has 16 divisors (see below), whose sum is σ = 21804854400. Its totient is φ = 20693541600.

The previous prime is 21245567989. The next prime is 21245568037. The reversal of 21245568007 is 70086554212.

It is not a de Polignac number, because 21245568007 - 2²⁷ = 21111350279 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 (21245568037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4565632 + ... + 4570282.

It is an arithmetic number, because the mean of its divisors is an integer number (1362803400).

Almost surely, 2^21245568007 is an apocalyptic number.

21245568007 is a deficient number, since it is larger than the sum of its proper divisors (559286393).

21245568007 is a wasteful number, since it uses less digits than its factorization.

21245568007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 21245568007 in words is "twenty-one billion, two hundred forty-five million, five hundred sixty-eight thousand, seven".