21150967 has 2 divisors, whose sum is σ = 21150968. Its totient is φ = 21150966.

The previous prime is 21150949. The next prime is 21150979. The reversal of 21150967 is 76905112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21150967 - 2¹⁹ = 20626679 is a prime.

It is equal to p_1338925 and since 21150967 and 1338925 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575483 + 10575484.

It is an arithmetic number, because the mean of its divisors is an integer number (10575484).

Almost surely, 2^21150967 is an apocalyptic number.

21150967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150967 is an equidigital number, since it uses as much as digits as its factorization.

21150967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 21150967 is about 4599.0180473662. The cubic root of 21150967 is about 276.5519611271.

The spelling of 21150967 in words is "twenty-one million, one hundred fifty thousand, nine hundred sixty-seven".