25335142021 has 4 divisors (see below), whose sum is σ = 28954448032. Its totient is φ = 21715836012.

The previous prime is 25335142009. The next prime is 25335142037. The reversal of 25335142021 is 12024153352.

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 25335142021 - 2¹⁷ = 25335010949 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 (25335146021) 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, 1809652995 + ... + 1809653008.

It is an arithmetic number, because the mean of its divisors is an integer number (7238612008).

Almost surely, 2^25335142021 is an apocalyptic number.

It is an amenable number.

25335142021 is a deficient number, since it is larger than the sum of its proper divisors (3619306011).

25335142021 is an equidigital number, since it uses as much as digits as its factorization.

25335142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3619306010.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 25335142021 its reverse (12024153352), we get a palindrome (37359295373).

The spelling of 25335142021 in words is "twenty-five billion, three hundred thirty-five million, one hundred forty-two thousand, twenty-one".