21534426453 has 8 divisors (see below), whose sum is σ = 29960941248. Its totient is φ = 13732097984.

The previous prime is 21534426437. The next prime is 21534426457. The reversal of 21534426453 is 35462443512.

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 21534426453 - 2⁴ = 21534426437 is a prime.

It is a super-2 number, since 2×21534426453² (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 (21534426457) 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, 156046500 + ... + 156046637.

It is an arithmetic number, because the mean of its divisors is an integer number (3745117656).

Almost surely, 2^21534426453 is an apocalyptic number.

21534426453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21534426453 is a deficient number, since it is larger than the sum of its proper divisors (8426514795).

21534426453 is a wasteful number, since it uses less digits than its factorization.

21534426453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312093163.

The product of its digits is 345600, while the sum is 39.

Adding to 21534426453 its reverse (35462443512), we get a palindrome (56996869965).

The spelling of 21534426453 in words is "twenty-one billion, five hundred thirty-four million, four hundred twenty-six thousand, four hundred fifty-three".