25221423215 has 8 divisors (see below), whose sum is σ = 30280462368. Its totient is φ = 20167302240.

The previous prime is 25221423173. The next prime is 25221423263. The reversal of 25221423215 is 51232412252.

It is a happy number.

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

It is not a de Polignac number, because 25221423215 - 2¹⁴ = 25221406831 is a prime.

It is a super-2 number, since 2×25221423215² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1218251 + ... + 1238780.

It is an arithmetic number, because the mean of its divisors is an integer number (3785057796).

Almost surely, 2^25221423215 is an apocalyptic number.

25221423215 is a deficient number, since it is larger than the sum of its proper divisors (5059039153).

25221423215 is a wasteful number, since it uses less digits than its factorization.

25221423215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459089.

The product of its digits is 9600, while the sum is 29.

Adding to 25221423215 its reverse (51232412252), we get a palindrome (76453835467).

The spelling of 25221423215 in words is "twenty-five billion, two hundred twenty-one million, four hundred twenty-three thousand, two hundred fifteen".