21001296 has 20 divisors (see below), whose sum is σ = 54253472. Its totient is φ = 7000416.

The previous prime is 21001247. The next prime is 21001319. The reversal of 21001296 is 69210012.

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, 218716 + ... + 218811.

Almost surely, 2^21001296 is an apocalyptic number.

It is an amenable number.

21001296 is an abundant number, since it is smaller than the sum of its proper divisors (33252176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001296 is a wasteful number, since it uses less digits than its factorization.

21001296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437538 (or 437532 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21001296 is about 4582.7170979671. The cubic root of 21001296 is about 275.8980930225.

The spelling of 21001296 in words is "twenty-one million, one thousand, two hundred ninety-six".