21222967 has 2 divisors, whose sum is σ = 21222968. Its totient is φ = 21222966.

The previous prime is 21222959. The next prime is 21222977. The reversal of 21222967 is 76922212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222967 - 2³ = 21222959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611483 + 10611484.

It is an arithmetic number, because the mean of its divisors is an integer number (10611484).

Almost surely, 2^21222967 is an apocalyptic number.

21222967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222967 is an equidigital number, since it uses as much as digits as its factorization.

21222967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 21222967 is about 4606.8391549955. The cubic root of 21222967 is about 276.8654092070.

The spelling of 21222967 in words is "twenty-one million, two hundred twenty-two thousand, nine hundred sixty-seven".