21313458 has 12 divisors (see below), whose sum is σ = 46179198. Its totient is φ = 7104480.

The previous prime is 21313451. The next prime is 21313469. The reversal of 21313458 is 85431312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12510369 + 8803089 = 3537^2 + 2967^2 .

It is not an unprimeable number, because it can be changed into a prime (21313451) 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 5 ways as a sum of consecutive naturals, for example, 592023 + ... + 592058.

Almost surely, 2^21313458 is an apocalyptic number.

21313458 is an abundant number, since it is smaller than the sum of its proper divisors (24865740).

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

21313458 is a wasteful number, since it uses less digits than its factorization.

21313458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184089 (or 1184086 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 21313458 is about 4616.6500842061. The cubic root of 21313458 is about 277.2583530633.

The spelling of 21313458 in words is "twenty-one million, three hundred thirteen thousand, four hundred fifty-eight".