21255401453 has 8 divisors (see below), whose sum is σ = 24971380896. Its totient is φ = 17836700400.

The previous prime is 21255401437. The next prime is 21255401513. The reversal of 21255401453 is 35410455212.

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 21255401453 - 2⁴ = 21255401437 is a prime.

It is a super-2 number, since 2×21255401453² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255401413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74319443 + ... + 74319728.

It is an arithmetic number, because the mean of its divisors is an integer number (3121422612).

Almost surely, 2^21255401453 is an apocalyptic number.

It is an amenable number.

21255401453 is a deficient number, since it is larger than the sum of its proper divisors (3715979443).

21255401453 is a wasteful number, since it uses less digits than its factorization.

21255401453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148639195.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21255401453 its reverse (35410455212), we get a palindrome (56665856665).

The spelling of 21255401453 in words is "twenty-one billion, two hundred fifty-five million, four hundred one thousand, four hundred fifty-three".