25123329021 has 8 divisors (see below), whose sum is σ = 38283168064. Its totient is φ = 14356188000.

The previous prime is 25123328999. The next prime is 25123329047. The reversal of 25123329021 is 12092332152.

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

It is not a de Polignac number, because 25123329021 - 2¹⁰ = 25123327997 is a prime.

It is a super-2 number, since 2×25123329021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25123329021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25123329071) 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, 598174480 + ... + 598174521.

It is an arithmetic number, because the mean of its divisors is an integer number (4785396008).

Almost surely, 2^25123329021 is an apocalyptic number.

25123329021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25123329021 is a deficient number, since it is larger than the sum of its proper divisors (13159839043).

25123329021 is a wasteful number, since it uses less digits than its factorization.

25123329021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196349011.

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 25123329021 in words is "twenty-five billion, one hundred twenty-three million, three hundred twenty-nine thousand, twenty-one".