21423058 has 4 divisors (see below), whose sum is σ = 32134590. Its totient is φ = 10711528.

The previous prime is 21423053. The next prime is 21423067. The reversal of 21423058 is 85032412.

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., 16507969 + 4915089 = 4063^2 + 2217^2 .

It is a super-3 number, since 3×21423058³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21423053) 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 as a sum of consecutive naturals, namely, 5355763 + ... + 5355766.

Almost surely, 2^21423058 is an apocalyptic number.

21423058 is a deficient number, since it is larger than the sum of its proper divisors (10711532).

21423058 is a wasteful number, since it uses less digits than its factorization.

21423058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10711531.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21423058 is about 4628.5049422033. The cubic root of 21423058 is about 277.7327884590.

The spelling of 21423058 in words is "twenty-one million, four hundred twenty-three thousand, fifty-eight".