25121222040 has 64 divisors (see below), whose sum is σ = 75374517600. Its totient is φ = 6698028032.

The previous prime is 25121222033. The next prime is 25121222047. The reversal of 25121222040 is 4022212152.

It is an interprime number because it is at equal distance from previous prime (25121222033) and next prime (25121222047).

It is a junction number, because it is equal to n+sod(n) for n = 25121221998 and 25121222016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121222047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1292716 + ... + 1312004.

Almost surely, 2^25121222040 is an apocalyptic number.

25121222040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25121222040 is an abundant number, since it is smaller than the sum of its proper divisors (50253295560).

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

25121222040 is a wasteful number, since it uses less digits than its factorization.

25121222040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30156 (or 30152 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 25121222040 its reverse (4022212152), we get a palindrome (29143434192).

The spelling of 25121222040 in words is "twenty-five billion, one hundred twenty-one million, two hundred twenty-two thousand, forty".