251223012404 has 24 divisors (see below), whose sum is σ = 541095719808. Its totient is φ = 99384927840.

The previous prime is 251223012373. The next prime is 251223012407. The reversal of 251223012404 is 404210322152.

It is a super-2 number, since 2×251223012404² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251223012407) 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, 345086192 + ... + 345086919.

It is an arithmetic number, because the mean of its divisors is an integer number (22545654992).

Almost surely, 2^251223012404 is an apocalyptic number.

It is an amenable number.

251223012404 is an abundant number, since it is smaller than the sum of its proper divisors (289872707404).

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

251223012404 is a wasteful number, since it uses less digits than its factorization.

251223012404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690173135 (or 690173133 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 251223012404 its reverse (404210322152), we get a palindrome (655433334556).

The spelling of 251223012404 in words is "two hundred fifty-one billion, two hundred twenty-three million, twelve thousand, four hundred four".