21007296 has 56 divisors (see below), whose sum is σ = 61762640. Its totient is φ = 7001856.

The previous prime is 21007289. The next prime is 21007307. The reversal of 21007296 is 69270012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4351 + ... + 7806.

Almost surely, 2^21007296 is an apocalyptic number.

It is an amenable number.

21007296 is an abundant number, since it is smaller than the sum of its proper divisors (40755344).

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

21007296 is a wasteful number, since it uses less digits than its factorization.

21007296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12178 (or 12162 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21007296 is about 4583.3716846880. The cubic root of 21007296 is about 275.9243649081.

The spelling of 21007296 in words is "twenty-one million, seven thousand, two hundred ninety-six".