21014087 has 2 divisors, whose sum is σ = 21014088. Its totient is φ = 21014086.

The previous prime is 21014069. The next prime is 21014093. The reversal of 21014087 is 78041012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21014087 - 2¹⁰ = 21013063 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21014047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507043 + 10507044.

It is an arithmetic number, because the mean of its divisors is an integer number (10507044).

Almost surely, 2^21014087 is an apocalyptic number.

21014087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014087 is an equidigital number, since it uses as much as digits as its factorization.

21014087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21014087 is about 4584.1124549906. The cubic root of 21014087 is about 275.9540942695.

Adding to 21014087 its reverse (78041012), we get a palindrome (99055099).

The spelling of 21014087 in words is "twenty-one million, fourteen thousand, eighty-seven".