21425058 has 18 divisors (see below), whose sum is σ = 46463547. Its totient is φ = 7135140.

The previous prime is 21425057. The next prime is 21425071. The reversal of 21425058 is 85052412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10712529 + 10712529 = 3273^2 + 3273^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3273.

It is a super-2 number, since 2×21425058² = 918066220606728, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21425057) 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 8 ways as a sum of consecutive naturals, for example, 19093 + ... + 20183.

Almost surely, 2^21425058 is an apocalyptic number.

21425058 is an abundant number, since it is smaller than the sum of its proper divisors (25038489).

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

21425058 is an equidigital number, since it uses as much as digits as its factorization.

21425058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 21425058 is about 4628.7209896471. The cubic root of 21425058 is about 277.7414309895.

Multiplying 21425058 by its product of nonzero digits (3200), we get a square (68560185600 = 261840²).

The spelling of 21425058 in words is "twenty-one million, four hundred twenty-five thousand, fifty-eight".