25230420421 has 4 divisors (see below), whose sum is σ = 25231178592. Its totient is φ = 25229662252.

The previous prime is 25230420373. The next prime is 25230420437. The reversal of 25230420421 is 12402403252.

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 25230420421 - 2²¹ = 25228323269 is a prime.

It is a super-2 number, since 2×25230420421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25230420491) 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, 326761 + ... + 396526.

It is an arithmetic number, because the mean of its divisors is an integer number (6307794648).

Almost surely, 2^25230420421 is an apocalyptic number.

It is an amenable number.

25230420421 is a deficient number, since it is larger than the sum of its proper divisors (758171).

25230420421 is an equidigital number, since it uses as much as digits as its factorization.

25230420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758170.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 25230420421 its reverse (12402403252), we get a palindrome (37632823673).

The spelling of 25230420421 in words is "twenty-five billion, two hundred thirty million, four hundred twenty thousand, four hundred twenty-one".