21454757 has 4 divisors (see below), whose sum is σ = 21468096. Its totient is φ = 21441420.

The previous prime is 21454747. The next prime is 21454777. The reversal of 21454757 is 75745412.

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 21454757 - 2¹² = 21450661 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 (21454747) 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, 3863 + ... + 7604.

It is an arithmetic number, because the mean of its divisors is an integer number (5367024).

Almost surely, 2^21454757 is an apocalyptic number.

It is an amenable number.

21454757 is a deficient number, since it is larger than the sum of its proper divisors (13339).

21454757 is a wasteful number, since it uses less digits than its factorization.

21454757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13338.

The product of its digits is 39200, while the sum is 35.

The square root of 21454757 is about 4631.9280003040. The cubic root of 21454757 is about 277.8697049996.

The spelling of 21454757 in words is "twenty-one million, four hundred fifty-four thousand, seven hundred fifty-seven".