21254311425 has 24 divisors (see below), whose sum is σ = 35159963904. Its totient is φ = 11329341760.

The previous prime is 21254311367. The next prime is 21254311469. The reversal of 21254311425 is 52411345212.

It is not a de Polignac number, because 21254311425 - 2⁶ = 21254311361 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21254311392 and 21254311401.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58999 + ... + 214451.

It is an arithmetic number, because the mean of its divisors is an integer number (1464998496).

Almost surely, 2^21254311425 is an apocalyptic number.

21254311425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21254311425 is a deficient number, since it is larger than the sum of its proper divisors (13905652479).

21254311425 is a wasteful number, since it uses less digits than its factorization.

21254311425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157289 (or 157284 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

Adding to 21254311425 its reverse (52411345212), we get a palindrome (73665656637).

The spelling of 21254311425 in words is "twenty-one billion, two hundred fifty-four million, three hundred eleven thousand, four hundred twenty-five".