525310400021 has 16 divisors (see below), whose sum is σ = 595084831488. Its totient is φ = 459524908800.

The previous prime is 525310399973. The next prime is 525310400089. The reversal of 525310400021 is 120004013525.

It is a cyclic number.

It is not a de Polignac number, because 525310400021 - 2²² = 525306205717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 525310400021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525310400221) 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, 7944941 + ... + 8010786.

It is an arithmetic number, because the mean of its divisors is an integer number (37192801968).

Almost surely, 2^525310400021 is an apocalyptic number.

It is an amenable number.

525310400021 is a deficient number, since it is larger than the sum of its proper divisors (69774431467).

525310400021 is a wasteful number, since it uses less digits than its factorization.

525310400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15955852.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 525310400021 its reverse (120004013525), we get a palindrome (645314413546).

The spelling of 525310400021 in words is "five hundred twenty-five billion, three hundred ten million, four hundred thousand, twenty-one".