25147421 has 4 divisors (see below), whose sum is σ = 27081852. Its totient is φ = 23212992.

The previous prime is 25147399. The next prime is 25147427. The reversal of 25147421 is 12474152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3422500 + 21724921 = 1850^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 25147421 - 2⁶ = 25147357 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 (25147427) 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, 967196 + ... + 967221.

It is an arithmetic number, because the mean of its divisors is an integer number (6770463).

Almost surely, 2^25147421 is an apocalyptic number.

It is an amenable number.

25147421 is a deficient number, since it is larger than the sum of its proper divisors (1934431).

25147421 is a wasteful number, since it uses less digits than its factorization.

25147421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934430.

The product of its digits is 2240, while the sum is 26.

The square root of 25147421 is about 5014.7204308914. The cubic root of 25147421 is about 292.9753965992.

The spelling of 25147421 in words is "twenty-five million, one hundred forty-seven thousand, four hundred twenty-one".