21230311453 has 8 divisors (see below), whose sum is σ = 22864569728. Its totient is φ = 19596218544.

The previous prime is 21230311429. The next prime is 21230311471. The reversal of 21230311453 is 35411303212.

It is a happy number.

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 21230311453 - 2¹⁷ = 21230180381 is a prime.

It is a super-2 number, since 2×21230311453² (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 (21230315453) 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, 399400 + ... + 449422.

It is an arithmetic number, because the mean of its divisors is an integer number (2858071216).

Almost surely, 2^21230311453 is an apocalyptic number.

It is an amenable number.

21230311453 is a deficient number, since it is larger than the sum of its proper divisors (1634258275).

21230311453 is a wasteful number, since it uses less digits than its factorization.

21230311453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82683.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21230311453 its reverse (35411303212), we get a palindrome (56641614665).

The spelling of 21230311453 in words is "twenty-one billion, two hundred thirty million, three hundred eleven thousand, four hundred fifty-three".