21276907 has 2 divisors, whose sum is σ = 21276908. Its totient is φ = 21276906.

The previous prime is 21276859. The next prime is 21276917. The reversal of 21276907 is 70967212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21276907 - 2²³ = 12888299 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (21276917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10638453 + 10638454.

It is an arithmetic number, because the mean of its divisors is an integer number (10638454).

Almost surely, 2^21276907 is an apocalyptic number.

21276907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21276907 is an equidigital number, since it uses as much as digits as its factorization.

21276907 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 21276907 is about 4612.6897792936. The cubic root of 21276907 is about 277.0997698706.

The spelling of 21276907 in words is "twenty-one million, two hundred seventy-six thousand, nine hundred seven".