21132097 has 16 divisors (see below), whose sum is σ = 25603200. Its totient is φ = 17055360.

The previous prime is 21132079. The next prime is 21132103. The reversal of 21132097 is 79023112.

It is not a de Polignac number, because 21132097 - 2¹¹ = 21130049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21132077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7054 + ... + 9592.

It is an arithmetic number, because the mean of its divisors is an integer number (1600200).

Almost surely, 2^21132097 is an apocalyptic number.

It is an amenable number.

21132097 is a deficient number, since it is larger than the sum of its proper divisors (4471103).

21132097 is a wasteful number, since it uses less digits than its factorization.

21132097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616.

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

The square root of 21132097 is about 4596.9660646996. The cubic root of 21132097 is about 276.4696939949.

The spelling of 21132097 in words is "twenty-one million, one hundred thirty-two thousand, ninety-seven".