25218921001 has 8 divisors (see below), whose sum is σ = 25799941440. Its totient is φ = 24643020048.

The previous prime is 25218920981. The next prime is 25218921019. The reversal of 25218921001 is 10012981252.

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 25218921001 - 2²⁹ = 24682050089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25218921601) 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, 1269906 + ... + 1289611.

It is an arithmetic number, because the mean of its divisors is an integer number (3224992680).

Almost surely, 2^25218921001 is an apocalyptic number.

It is an amenable number.

25218921001 is a deficient number, since it is larger than the sum of its proper divisors (581020439).

25218921001 is a wasteful number, since it uses less digits than its factorization.

25218921001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559743.

The product of its (nonzero) digits is 2880, while the sum is 31.

The spelling of 25218921001 in words is "twenty-five billion, two hundred eighteen million, nine hundred twenty-one thousand, one".