21967403 has 2 divisors, whose sum is σ = 21967404.
Its totient is φ = 21967402.
The previous prime is 21967397. The next prime is 21967409. The reversal of 21967403 is 30476912.
It is a balanced prime because it is at equal distance from previous prime (21967397) and next prime (21967409).
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-21967403 is a prime.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 21967403.
It is not a weakly prime, because it can be changed into another prime (21967409) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10983701 + 10983702.
It is an arithmetic number, because the mean of its divisors is an integer number (10983702).
Almost surely, 221967403 is an apocalyptic number.
21967403 is a deficient number, since it is larger than the sum of its proper divisors (1).
21967403 is an equidigital number, since it uses as much as digits as its factorization.
21967403 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 9072, while the sum is 32.
The square root of 21967403 is about 4686.9396198372.
The cubic root of 21967403 is about 280.0654736344.
The spelling of 21967403 in words is "twenty-one million, nine hundred sixty-seven thousand, four hundred three".