25070021 has 4 divisors (see below), whose sum is σ = 25150944. Its totient is φ = 24989100.

The previous prime is 25070009. The next prime is 25070039. The reversal of 25070021 is 12007052.

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 25070021 - 2¹⁰ = 25068997 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 (25070821) 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, 39995 + ... + 40616.

It is an arithmetic number, because the mean of its divisors is an integer number (6287736).

Almost surely, 2^25070021 is an apocalyptic number.

It is an amenable number.

25070021 is a deficient number, since it is larger than the sum of its proper divisors (80923).

25070021 is an equidigital number, since it uses as much as digits as its factorization.

25070021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80922.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 25070021 is about 5006.9972039137. The cubic root of 25070021 is about 292.6745095446.

Adding to 25070021 its reverse (12007052), we get a palindrome (37077073).

The spelling of 25070021 in words is "twenty-five million, seventy thousand, twenty-one".