21542331656453 has 4 divisors (see below), whose sum is σ = 22676138585760. Its totient is φ = 20408524727148.

The previous prime is 21542331656437. The next prime is 21542331656497. The reversal of 21542331656453 is 35465613324512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21542331656453 - 2⁴ = 21542331656437 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 (21542331656423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566903464625 + ... + 566903464662.

It is an arithmetic number, because the mean of its divisors is an integer number (5669034646440).

Almost surely, 2^{21542331656453} is an apocalyptic number.

It is an amenable number.

21542331656453 is a deficient number, since it is larger than the sum of its proper divisors (1133806929307).

21542331656453 is a wasteful number, since it uses less digits than its factorization.

21542331656453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133806929306.

The product of its digits is 7776000, while the sum is 50.

The spelling of 21542331656453 in words is "twenty-one trillion, five hundred forty-two billion, three hundred thirty-one million, six hundred fifty-six thousand, four hundred fifty-three".