21974043 has 16 divisors (see below), whose sum is σ = 36060416. Its totient is φ = 11590560.

The previous prime is 21974033. The next prime is 21974053. The reversal of 21974043 is 34047912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21974033) and next prime (21974053).

It is not a de Polignac number, because 21974043 - 2¹⁷ = 21842971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21974043.

It is not an unprimeable number, because it can be changed into a prime (21974033) 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 in 15 ways as a sum of consecutive naturals, for example, 39973 + ... + 40518.

It is an arithmetic number, because the mean of its divisors is an integer number (2253776).

Almost surely, 2^21974043 is an apocalyptic number.

21974043 is a deficient number, since it is larger than the sum of its proper divisors (14086373).

21974043 is a wasteful number, since it uses less digits than its factorization.

21974043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80514.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21974043 is about 4687.6479176662. The cubic root of 21974043 is about 280.0936888860.

The spelling of 21974043 in words is "twenty-one million, nine hundred seventy-four thousand, forty-three".