21455450153021 has 8 divisors (see below), whose sum is σ = 22908953855040. Its totient is φ = 20045334621312.

The previous prime is 21455450153009. The next prime is 21455450153063. The reversal of 21455450153021 is 12035105455412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21455450153021 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 (21455450153321) 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, 10847041556 + ... + 10847043533.

It is an arithmetic number, because the mean of its divisors is an integer number (2863619231880).

Almost surely, 2^{21455450153021} is an apocalyptic number.

It is an amenable number.

21455450153021 is a deficient number, since it is larger than the sum of its proper divisors (1453503702019).

21455450153021 is a wasteful number, since it uses less digits than its factorization.

21455450153021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21694085155.

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 21455450153021 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifty million, one hundred fifty-three thousand, twenty-one".