21245568001 has 4 divisors (see below), whose sum is σ = 24280649152. Its totient is φ = 18210486852.

The previous prime is 21245567989. The next prime is 21245568037. The reversal of 21245568001 is 10086554212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21245568001 - 2¹¹ = 21245565953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21245560001) 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, 1517540565 + ... + 1517540578.

It is an arithmetic number, because the mean of its divisors is an integer number (6070162288).

Almost surely, 2^21245568001 is an apocalyptic number.

It is an amenable number.

21245568001 is a deficient number, since it is larger than the sum of its proper divisors (3035081151).

21245568001 is an equidigital number, since it uses as much as digits as its factorization.

21245568001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3035081150.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 21245568001 in words is "twenty-one billion, two hundred forty-five million, five hundred sixty-eight thousand, one".