21453311425 has 24 divisors (see below), whose sum is σ = 32741057216. Its totient is φ = 13579237440.

The previous prime is 21453311419. The next prime is 21453311437. The reversal of 21453311425 is 52411335412.

It is not a de Polignac number, because 21453311425 - 2¹⁹ = 21452787137 is a prime.

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, 4712739 + ... + 4717288.

Almost surely, 2^21453311425 is an apocalyptic number.

21453311425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21453311425 is a deficient number, since it is larger than the sum of its proper divisors (11287745791).

21453311425 is a wasteful number, since it uses less digits than its factorization.

21453311425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9430057 (or 9430052 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

Adding to 21453311425 its reverse (52411335412), we get a palindrome (73864646837).

The spelling of 21453311425 in words is "twenty-one billion, four hundred fifty-three million, three hundred eleven thousand, four hundred twenty-five".