21139502 has 8 divisors (see below), whose sum is σ = 32023512. Its totient is φ = 10465000.

The previous prime is 21139453. The next prime is 21139513. The reversal of 21139502 is 20593112.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 52124 + ... + 52527.

It is an arithmetic number, because the mean of its divisors is an integer number (4002939).

Almost surely, 2^21139502 is an apocalyptic number.

21139502 is a deficient number, since it is larger than the sum of its proper divisors (10884010).

21139502 is a wasteful number, since it uses less digits than its factorization.

21139502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104754.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 21139502 is about 4597.7714166757. The cubic root of 21139502 is about 276.5019832498.

The spelling of 21139502 in words is "twenty-one million, one hundred thirty-nine thousand, five hundred two".