21076087 has 2 divisors, whose sum is σ = 21076088. Its totient is φ = 21076086.

The previous prime is 21076061. The next prime is 21076093. The reversal of 21076087 is 78067012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21076087 - 2¹⁹ = 20551799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21076037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538043 + 10538044.

It is an arithmetic number, because the mean of its divisors is an integer number (10538044).

Almost surely, 2^21076087 is an apocalyptic number.

21076087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21076087 is an equidigital number, since it uses as much as digits as its factorization.

21076087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 21076087 is about 4590.8699611294. The cubic root of 21076087 is about 276.2252196195.

The spelling of 21076087 in words is "twenty-one million, seventy-six thousand, eighty-seven".