25292421 has 24 divisors (see below), whose sum is σ = 45549504. Its totient is φ = 13138560.

The previous prime is 25292419. The next prime is 25292453. The reversal of 25292421 is 12429252.

It is a happy number.

It is not a de Polignac number, because 25292421 - 2¹ = 25292419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25292921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17556 + ... + 18941.

It is an arithmetic number, because the mean of its divisors is an integer number (1897896).

Almost surely, 2^25292421 is an apocalyptic number.

25292421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25292421 is a deficient number, since it is larger than the sum of its proper divisors (20257083).

25292421 is a wasteful number, since it uses less digits than its factorization.

25292421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36521 (or 36518 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 25292421 is about 5029.1570864311. The cubic root of 25292421 is about 293.5374163753.

It can be divided in two parts, 2529 and 2421, that added together give a triangular number (4950 = T₉₉).

The spelling of 25292421 in words is "twenty-five million, two hundred ninety-two thousand, four hundred twenty-one".