21951367 has 2 divisors, whose sum is σ = 21951368. Its totient is φ = 21951366.

The previous prime is 21951353. The next prime is 21951383. The reversal of 21951367 is 76315912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21951367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21951067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10975683 + 10975684.

It is an arithmetic number, because the mean of its divisors is an integer number (10975684).

Almost surely, 2^21951367 is an apocalyptic number.

21951367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21951367 is an equidigital number, since it uses as much as digits as its factorization.

21951367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 34.

The square root of 21951367 is about 4685.2285963440. The cubic root of 21951367 is about 279.9973086476.

The spelling of 21951367 in words is "twenty-one million, nine hundred fifty-one thousand, three hundred sixty-seven".