25200245516021 has 4 divisors (see below), whose sum is σ = 25201879047072. Its totient is φ = 25198611984972.

The previous prime is 25200245515957. The next prime is 25200245516101. The reversal of 25200245516021 is 12061554200252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25200245516021 - 2⁶ = 25200245515957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25200245516921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816742385 + ... + 816773238.

It is an arithmetic number, because the mean of its divisors is an integer number (6300469761768).

Almost surely, 2^{25200245516021} is an apocalyptic number.

It is an amenable number.

25200245516021 is a deficient number, since it is larger than the sum of its proper divisors (1633531051).

25200245516021 is a wasteful number, since it uses less digits than its factorization.

25200245516021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633531050.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 25200245516021 its reverse (12061554200252), we get a palindrome (37261799716273).

The spelling of 25200245516021 in words is "twenty-five trillion, two hundred billion, two hundred forty-five million, five hundred sixteen thousand, twenty-one".