21050332 has 6 divisors (see below), whose sum is σ = 36838088. Its totient is φ = 10525164.

The previous prime is 21050311. The next prime is 21050339. The reversal of 21050332 is 23305012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631288 + ... + 2631295.

Almost surely, 2^21050332 is an apocalyptic number.

It is an amenable number.

21050332 is a deficient number, since it is larger than the sum of its proper divisors (15787756).

21050332 is a wasteful number, since it uses less digits than its factorization.

21050332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5262587 (or 5262585 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 21050332 is about 4588.0640797617. The cubic root of 21050332 is about 276.1126579227.

Subtracting from 21050332 its sum of digits (16), we obtain a triangular number (21050316 = T₆₄₈₈).

Adding to 21050332 its reverse (23305012), we get a palindrome (44355344).

The spelling of 21050332 in words is "twenty-one million, fifty thousand, three hundred thirty-two".