25343021421 has 16 divisors (see below), whose sum is σ = 38059537920. Its totient is φ = 16663903200.

The previous prime is 25343021401. The next prime is 25343021437. The reversal of 25343021421 is 12412034352.

It is not a de Polignac number, because 25343021421 - 2¹³ = 25343013229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25343021401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6427005 + ... + 6430946.

It is an arithmetic number, because the mean of its divisors is an integer number (2378721120).

Almost surely, 2^25343021421 is an apocalyptic number.

It is an amenable number.

25343021421 is a deficient number, since it is larger than the sum of its proper divisors (12716516499).

25343021421 is a wasteful number, since it uses less digits than its factorization.

25343021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12858033 (or 12858027 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 25343021421 its reverse (12412034352), we get a palindrome (37755055773).

The spelling of 25343021421 in words is "twenty-five billion, three hundred forty-three million, twenty-one thousand, four hundred twenty-one".