25061621 has 16 divisors (see below), whose sum is σ = 28804608. Its totient is φ = 21600000.

The previous prime is 25061593. The next prime is 25061639. The reversal of 25061621 is 12616052.

It is a cyclic number.

It is not a de Polignac number, because 25061621 - 2¹⁰ = 25060597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25061221) 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, 32996 + ... + 33746.

It is an arithmetic number, because the mean of its divisors is an integer number (1800288).

Almost surely, 2^25061621 is an apocalyptic number.

It is an amenable number.

25061621 is a deficient number, since it is larger than the sum of its proper divisors (3742987).

25061621 is a wasteful number, since it uses less digits than its factorization.

25061621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 25061621 is about 5006.1583075248. The cubic root of 25061621 is about 292.6418179018.

Adding to 25061621 its reverse (12616052), we get a palindrome (37677673).

The spelling of 25061621 in words is "twenty-five million, sixty-one thousand, six hundred twenty-one".