21709725001 has 8 divisors (see below), whose sum is σ = 22861460160. Its totient is φ = 20575309392.

The previous prime is 21709724969. The next prime is 21709725031. The reversal of 21709725001 is 10052790712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21709725001 - 2⁵ = 21709724969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21709725031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4327315 + ... + 4332328.

It is an arithmetic number, because the mean of its divisors is an integer number (2857682520).

Almost surely, 2^21709725001 is an apocalyptic number.

It is an amenable number.

21709725001 is a deficient number, since it is larger than the sum of its proper divisors (1151735159).

21709725001 is a wasteful number, since it uses less digits than its factorization.

21709725001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8659775.

The product of its (nonzero) digits is 8820, while the sum is 34.

The spelling of 21709725001 in words is "twenty-one billion, seven hundred nine million, seven hundred twenty-five thousand, one".