21754513 has 8 divisors (see below), whose sum is σ = 23855040. Its totient is φ = 19674480.

The previous prime is 21754507. The next prime is 21754519. The reversal of 21754513 is 31545712.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21754507) and next prime (21754519).

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-21754513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21754519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2853 + ... + 7186.

It is an arithmetic number, because the mean of its divisors is an integer number (2981880).

Almost surely, 2^21754513 is an apocalyptic number.

It is an amenable number.

21754513 is a deficient number, since it is larger than the sum of its proper divisors (2100527).

21754513 is a wasteful number, since it uses less digits than its factorization.

21754513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10247.

The product of its digits is 4200, while the sum is 28.

The square root of 21754513 is about 4664.1733458353. The cubic root of 21754513 is about 279.1578137932.

The spelling of 21754513 in words is "twenty-one million, seven hundred fifty-four thousand, five hundred thirteen".