21496187 has 2 divisors, whose sum is σ = 21496188. Its totient is φ = 21496186.

The previous prime is 21496169. The next prime is 21496199. The reversal of 21496187 is 78169412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21496187 - 2²⁴ = 4718971 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21496187.

It is not a weakly prime, because it can be changed into another prime (21496117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10748093 + 10748094.

It is an arithmetic number, because the mean of its divisors is an integer number (10748094).

Almost surely, 2^21496187 is an apocalyptic number.

21496187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21496187 is an equidigital number, since it uses as much as digits as its factorization.

21496187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 21496187 is about 4636.3980631520. The cubic root of 21496187 is about 278.0484491927.

The spelling of 21496187 in words is "twenty-one million, four hundred ninety-six thousand, one hundred eighty-seven".