21413758 has 4 divisors (see below), whose sum is σ = 32120640. Its totient is φ = 10706878.

The previous prime is 21413753. The next prime is 21413773. The reversal of 21413758 is 85731412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5353438 + ... + 5353441.

It is an arithmetic number, because the mean of its divisors is an integer number (8030160).

Almost surely, 2^21413758 is an apocalyptic number.

21413758 is a deficient number, since it is larger than the sum of its proper divisors (10706882).

21413758 is a wasteful number, since it uses less digits than its factorization.

21413758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10706881.

The product of its digits is 6720, while the sum is 31.

The square root of 21413758 is about 4627.5001890870. The cubic root of 21413758 is about 277.6925936250.

The spelling of 21413758 in words is "twenty-one million, four hundred thirteen thousand, seven hundred fifty-eight".