21097006 has 8 divisors (see below), whose sum is σ = 36166320. Its totient is φ = 9041568.

The previous prime is 21096991. The next prime is 21097009. The reversal of 21097006 is 60079012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753451 + ... + 753478.

It is an arithmetic number, because the mean of its divisors is an integer number (4520790).

Almost surely, 2^21097006 is an apocalyptic number.

21097006 is a deficient number, since it is larger than the sum of its proper divisors (15069314).

21097006 is a wasteful number, since it uses less digits than its factorization.

21097006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506938.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21097006 is about 4593.1477224230. The cubic root of 21097006 is about 276.3165782077.

The spelling of 21097006 in words is "twenty-one million, ninety-seven thousand, six".