455450021 has 8 divisors (see below), whose sum is σ = 491555064. Its totient is φ = 419497920.

The previous prime is 455449997. The next prime is 455450053. The reversal of 455450021 is 120054554.

It can be written as a sum of positive squares in 4 ways, for example, as 2356225 + 453093796 = 1535^2 + 21286^2 .

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 455450021 - 2¹⁴ = 455433637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (455450081) 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, 32006 + ... + 43991.

It is an arithmetic number, because the mean of its divisors is an integer number (61444383).

Almost surely, 2^455450021 is an apocalyptic number.

It is an amenable number.

455450021 is a deficient number, since it is larger than the sum of its proper divisors (36105043).

455450021 is a wasteful number, since it uses less digits than its factorization.

455450021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76471.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 455450021 is about 21341.2750556287. The cubic root of 455450021 is about 769.3906580811.

The spelling of 455450021 in words is "four hundred fifty-five million, four hundred fifty thousand, twenty-one".