21426058 has 4 divisors (see below), whose sum is σ = 32139090. Its totient is φ = 10713028.

The previous prime is 21426049. The next prime is 21426059. The reversal of 21426058 is 85062412.

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., 20548089 + 877969 = 4533^2 + 937^2 .

It is a super-2 number, since 2×21426058² = 918151922838728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21426059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5356513 + ... + 5356516.

Almost surely, 2^21426058 is an apocalyptic number.

21426058 is a deficient number, since it is larger than the sum of its proper divisors (10713032).

21426058 is a wasteful number, since it uses less digits than its factorization.

21426058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10713031.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21426058 is about 4628.8290095876. The cubic root of 21426058 is about 277.7457520530.

The spelling of 21426058 in words is "twenty-one million, four hundred twenty-six thousand, fifty-eight".