21259064 has 16 divisors (see below), whose sum is σ = 40072320. Its totient is φ = 10573120.

The previous prime is 21259037. The next prime is 21259093. The reversal of 21259064 is 46095212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5429 + ... + 8484.

It is an arithmetic number, because the mean of its divisors is an integer number (2504520).

Almost surely, 2^21259064 is an apocalyptic number.

It is an amenable number.

21259064 is a deficient number, since it is larger than the sum of its proper divisors (18813256).

21259064 is a wasteful number, since it uses less digits than its factorization.

21259064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14110 (or 14106 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21259064 is about 4610.7552526674. The cubic root of 21259064 is about 277.0222887789.

The spelling of 21259064 in words is "twenty-one million, two hundred fifty-nine thousand, sixty-four".