21458362 has 4 divisors (see below), whose sum is σ = 32187546. Its totient is φ = 10729180.

The previous prime is 21458351. The next prime is 21458363. The reversal of 21458362 is 26385412.

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

It can be written as a sum of positive squares in only one way, i.e., 21335161 + 123201 = 4619^2 + 351^2 .

It is a super-2 number, since 2×21458362² = 920922599446088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21458363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5364589 + ... + 5364592.

Almost surely, 2^21458362 is an apocalyptic number.

21458362 is a deficient number, since it is larger than the sum of its proper divisors (10729184).

21458362 is a wasteful number, since it uses less digits than its factorization.

21458362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10729183.

The product of its digits is 11520, while the sum is 31.

The square root of 21458362 is about 4632.3171307673. The cubic root of 21458362 is about 277.8852674253.

The spelling of 21458362 in words is "twenty-one million, four hundred fifty-eight thousand, three hundred sixty-two".