21267011 has 2 divisors, whose sum is σ = 21267012. Its totient is φ = 21267010.

The previous prime is 21266977. The next prime is 21267031. The reversal of 21267011 is 11076212.

It is an a-pointer prime, because the next prime (21267031) can be obtained adding 21267011 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21267011 - 2²² = 17072707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21267031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10633505 + 10633506.

It is an arithmetic number, because the mean of its divisors is an integer number (10633506).

Almost surely, 2^21267011 is an apocalyptic number.

21267011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21267011 is an equidigital number, since it uses as much as digits as its factorization.

21267011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21267011 is about 4611.6169615440. The cubic root of 21267011 is about 277.0568030276.

The spelling of 21267011 in words is "twenty-one million, two hundred sixty-seven thousand, eleven".