21133502 has 16 divisors (see below), whose sum is σ = 34240752. Its totient is φ = 9724800.

The previous prime is 21133493. The next prime is 21133513. The reversal of 21133502 is 20533112.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9413 + ... + 11439.

It is an arithmetic number, because the mean of its divisors is an integer number (2140047).

Almost surely, 2^21133502 is an apocalyptic number.

21133502 is a deficient number, since it is larger than the sum of its proper divisors (13107250).

21133502 is a wasteful number, since it uses less digits than its factorization.

21133502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21133502 is about 4597.1188803423. The cubic root of 21133502 is about 276.4758210302.

Adding to 21133502 its reverse (20533112), we get a palindrome (41666614).

The spelling of 21133502 in words is "twenty-one million, one hundred thirty-three thousand, five hundred two".