25121919228 has 48 divisors (see below), whose sum is σ = 68255792640. Its totient is φ = 7042261824.

The previous prime is 25121919227. The next prime is 25121919241. The reversal of 25121919228 is 82291912152.

It is a super-2 number, since 2×25121919228² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 25121919228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121919227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2816968 + ... + 2825871.

It is an arithmetic number, because the mean of its divisors is an integer number (1421995680).

Almost surely, 2^25121919228 is an apocalyptic number.

25121919228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25121919228 is an abundant number, since it is smaller than the sum of its proper divisors (43133873412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25121919228 is a wasteful number, since it uses less digits than its factorization.

25121919228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5642906 (or 5642904 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The spelling of 25121919228 in words is "twenty-five billion, one hundred twenty-one million, nine hundred nineteen thousand, two hundred twenty-eight".