21974469 has 32 divisors (see below), whose sum is σ = 34076160. Its totient is φ = 12456000.

The previous prime is 21974467. The next prime is 21974471. The reversal of 21974469 is 96447912.

It is an interprime number because it is at equal distance from previous prime (21974467) and next prime (21974471).

It is not a de Polignac number, because 21974469 - 2¹ = 21974467 is a prime.

It is a super-2 number, since 2×21974469² = 965754575663922, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21974469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21974461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63154 + ... + 63500.

It is an arithmetic number, because the mean of its divisors is an integer number (1064880).

Almost surely, 2^21974469 is an apocalyptic number.

It is an amenable number.

21974469 is a deficient number, since it is larger than the sum of its proper divisors (12101691).

21974469 is a wasteful number, since it uses less digits than its factorization.

21974469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481.

The product of its digits is 108864, while the sum is 42.

The square root of 21974469 is about 4687.6933560121. The cubic root of 21974469 is about 280.0954988873.

It can be divided in two parts, 2197 and 4469, that added together give a palindrome (6666).

The spelling of 21974469 in words is "twenty-one million, nine hundred seventy-four thousand, four hundred sixty-nine".