21010328 has 8 divisors (see below), whose sum is σ = 39394380. Its totient is φ = 10505160.

The previous prime is 21010321. The next prime is 21010337. The reversal of 21010328 is 82301012.

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 (21010321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313138 + ... + 1313153.

Almost surely, 2^21010328 is an apocalyptic number.

It is an amenable number.

21010328 is a deficient number, since it is larger than the sum of its proper divisors (18384052).

21010328 is a wasteful number, since it uses less digits than its factorization.

21010328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626297 (or 2626293 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21010328 is about 4583.7024336228. The cubic root of 21010328 is about 275.9376390650.

The spelling of 21010328 in words is "twenty-one million, ten thousand, three hundred twenty-eight".