21025125241 has 16 divisors (see below), whose sum is σ = 23445115200. Its totient is φ = 18737630208.

The previous prime is 21025125221. The next prime is 21025125269. The reversal of 21025125241 is 14252152012.

It is a cyclic number.

It is not a de Polignac number, because 21025125241 - 2⁷ = 21025125113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21025125221) 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, 688881 + ... + 718753.

It is an arithmetic number, because the mean of its divisors is an integer number (1465319700).

Almost surely, 2^21025125241 is an apocalyptic number.

It is an amenable number.

21025125241 is a deficient number, since it is larger than the sum of its proper divisors (2419989959).

21025125241 is a wasteful number, since it uses less digits than its factorization.

21025125241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32088.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21025125241 its reverse (14252152012), we get a palindrome (35277277253).

The spelling of 21025125241 in words is "twenty-one billion, twenty-five million, one hundred twenty-five thousand, two hundred forty-one".