25142721 has 8 divisors (see below), whose sum is σ = 34429824. Its totient is φ = 16308720.

The previous prime is 25142693. The next prime is 25142731. The reversal of 25142721 is 12724152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25142721 - 2²³ = 16754113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25142691 and 25142700.

It is not an unprimeable number, because it can be changed into a prime (25142731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113145 + ... + 113366.

It is an arithmetic number, because the mean of its divisors is an integer number (4303728).

Almost surely, 2^25142721 is an apocalyptic number.

It is an amenable number.

25142721 is a deficient number, since it is larger than the sum of its proper divisors (9287103).

25142721 is a wasteful number, since it uses less digits than its factorization.

25142721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226551.

The product of its digits is 1120, while the sum is 24.

The square root of 25142721 is about 5014.2517886520. The cubic root of 25142721 is about 292.9571433005.

Adding to 25142721 its reverse (12724152), we get a palindrome (37866873).

The spelling of 25142721 in words is "twenty-five million, one hundred forty-two thousand, seven hundred twenty-one".