21126967 has 2 divisors, whose sum is σ = 21126968. Its totient is φ = 21126966.

The previous prime is 21126961. The next prime is 21126983. The reversal of 21126967 is 76962112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21126967 - 2¹⁹ = 20602679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21126961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563483 + 10563484.

It is an arithmetic number, because the mean of its divisors is an integer number (10563484).

Almost surely, 2^21126967 is an apocalyptic number.

21126967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126967 is an equidigital number, since it uses as much as digits as its factorization.

21126967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 21126967 is about 4596.4080541223. The cubic root of 21126967 is about 276.4473203783.

The spelling of 21126967 in words is "twenty-one million, one hundred twenty-six thousand, nine hundred sixty-seven".