21672097 has 2 divisors, whose sum is σ = 21672098. Its totient is φ = 21672096.

The previous prime is 21672089. The next prime is 21672107. The reversal of 21672097 is 79027612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 9728161 = 3456^2 + 3119^2 .

It is a cyclic number.

It is not a de Polignac number, because 21672097 - 2³ = 21672089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21672997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10836048 + 10836049.

It is an arithmetic number, because the mean of its divisors is an integer number (10836049).

Almost surely, 2^21672097 is an apocalyptic number.

It is an amenable number.

21672097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21672097 is an equidigital number, since it uses as much as digits as its factorization.

21672097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21672097 is about 4655.3299560826. The cubic root of 21672097 is about 278.8048420452.

The spelling of 21672097 in words is "twenty-one million, six hundred seventy-two thousand, ninety-seven".