21170454 has 8 divisors (see below), whose sum is σ = 42340920. Its totient is φ = 7056816.

The previous prime is 21170453. The next prime is 21170507. The reversal of 21170454 is 45407112.

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

21170454 is an admirable number.

It is a super-2 number, since 2×21170454² = 896376245132232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170453) 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, 1764199 + ... + 1764210.

It is an arithmetic number, because the mean of its divisors is an integer number (5292615).

Almost surely, 2^21170454 is an apocalyptic number.

21170454 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21170454 is a wasteful number, since it uses less digits than its factorization.

21170454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3528414.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 21170454 is about 4601.1361640360. The cubic root of 21170454 is about 276.6368668409.

Adding to 21170454 its reverse (45407112), we get a palindrome (66577566).

The spelling of 21170454 in words is "twenty-one million, one hundred seventy thousand, four hundred fifty-four".