21339512 has 8 divisors (see below), whose sum is σ = 40011600. Its totient is φ = 10669752.

The previous prime is 21339511. The next prime is 21339529. The reversal of 21339512 is 21593312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339511) 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, 1333712 + ... + 1333727.

It is an arithmetic number, because the mean of its divisors is an integer number (5001450).

Almost surely, 2^21339512 is an apocalyptic number.

It is an amenable number.

21339512 is a deficient number, since it is larger than the sum of its proper divisors (18672088).

21339512 is a wasteful number, since it uses less digits than its factorization.

21339512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667445 (or 2667441 counting only the distinct ones).

The product of its digits is 1620, while the sum is 26.

The square root of 21339512 is about 4619.4709653812. The cubic root of 21339512 is about 277.3712824569.

The spelling of 21339512 in words is "twenty-one million, three hundred thirty-nine thousand, five hundred twelve".