251400020022 has 12 divisors (see below), whose sum is σ = 544700043420. Its totient is φ = 83800006668.

The previous prime is 251400020017. The next prime is 251400020071. The reversal of 251400020022 is 220020004152.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 13966667779 = 251400020022 / (2 + 5 + 1 + 4 + 0 + 0 + 0 + 2 + 0 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 251400019977 and 251400020004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6983333872 + ... + 6983333907.

It is an arithmetic number, because the mean of its divisors is an integer number (45391670285).

Almost surely, 2^251400020022 is an apocalyptic number.

251400020022 is an abundant number, since it is smaller than the sum of its proper divisors (293300023398).

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

251400020022 is a wasteful number, since it uses less digits than its factorization.

251400020022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13966667787 (or 13966667784 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 251400020022 its reverse (220020004152), we get a palindrome (471420024174).

The spelling of 251400020022 in words is "two hundred fifty-one billion, four hundred million, twenty thousand, twenty-two".