25251421436 has 6 divisors (see below), whose sum is σ = 44189987520. Its totient is φ = 12625710716.

The previous prime is 25251421397. The next prime is 25251421457. The reversal of 25251421436 is 63412415252.

It is a junction number, because it is equal to n+sod(n) for n = 25251421396 and 25251421405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3156427676 + ... + 3156427683.

It is an arithmetic number, because the mean of its divisors is an integer number (7364997920).

Almost surely, 2^25251421436 is an apocalyptic number.

It is an amenable number.

25251421436 is a deficient number, since it is larger than the sum of its proper divisors (18938566084).

25251421436 is a wasteful number, since it uses less digits than its factorization.

25251421436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6312855363 (or 6312855361 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

Adding to 25251421436 its reverse (63412415252), we get a palindrome (88663836688).

The spelling of 25251421436 in words is "twenty-five billion, two hundred fifty-one million, four hundred twenty-one thousand, four hundred thirty-six".