21076427 has 2 divisors, whose sum is σ = 21076428. Its totient is φ = 21076426.

The previous prime is 21076423. The next prime is 21076463. The reversal of 21076427 is 72467012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21076427 - 2² = 21076423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21076427.

It is not a weakly prime, because it can be changed into another prime (21076423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538213 + 10538214.

It is an arithmetic number, because the mean of its divisors is an integer number (10538214).

Almost surely, 2^21076427 is an apocalyptic number.

21076427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21076427 is an equidigital number, since it uses as much as digits as its factorization.

21076427 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 29.

The square root of 21076427 is about 4590.9069909986. The cubic root of 21076427 is about 276.2267049691.

The spelling of 21076427 in words is "twenty-one million, seventy-six thousand, four hundred twenty-seven".