21403058 has 4 divisors (see below), whose sum is σ = 32104590. Its totient is φ = 10701528.

The previous prime is 21403049. The next prime is 21403061. The reversal of 21403058 is 85030412.

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., 13010449 + 8392609 = 3607^2 + 2897^2 .

It is a super-3 number, since 3×21403058³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350763 + ... + 5350766.

Almost surely, 2^21403058 is an apocalyptic number.

21403058 is a deficient number, since it is larger than the sum of its proper divisors (10701532).

21403058 is a wasteful number, since it uses less digits than its factorization.

21403058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10701531.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21403058 is about 4626.3439128539. The cubic root of 21403058 is about 277.6463335557.

The spelling of 21403058 in words is "twenty-one million, four hundred three thousand, fifty-eight".