21974467 has 2 divisors, whose sum is σ = 21974468. Its totient is φ = 21974466.

The previous prime is 21974461. The next prime is 21974471. The reversal of 21974467 is 76447912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21974467 - 2¹⁹ = 21450179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21974461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10987233 + 10987234.

It is an arithmetic number, because the mean of its divisors is an integer number (10987234).

Almost surely, 2^21974467 is an apocalyptic number.

21974467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21974467 is an equidigital number, since it uses as much as digits as its factorization.

21974467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The square root of 21974467 is about 4687.6931426876. The cubic root of 21974467 is about 280.0954903897.

The spelling of 21974467 in words is "twenty-one million, nine hundred seventy-four thousand, four hundred sixty-seven".