21253231453 has 8 divisors (see below), whose sum is σ = 21388631040. Its totient is φ = 21117929040.

The previous prime is 21253231423. The next prime is 21253231481. The reversal of 21253231453 is 35413235212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21253231453 - 2¹⁷ = 21253100381 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 (21253231423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442948 + ... + 488578.

It is an arithmetic number, because the mean of its divisors is an integer number (2673578880).

Almost surely, 2^21253231453 is an apocalyptic number.

It is an amenable number.

21253231453 is a deficient number, since it is larger than the sum of its proper divisors (135399587).

21253231453 is a wasteful number, since it uses less digits than its factorization.

21253231453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48587.

The product of its digits is 21600, while the sum is 31.

Adding to 21253231453 its reverse (35413235212), we get a palindrome (56666466665).

The spelling of 21253231453 in words is "twenty-one billion, two hundred fifty-three million, two hundred thirty-one thousand, four hundred fifty-three".