21983467 has 4 divisors (see below), whose sum is σ = 23981976. Its totient is φ = 19984960.

The previous prime is 21983453. The next prime is 21983483. The reversal of 21983467 is 76438912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21983467 - 2¹¹ = 21981419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21983407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999238 + ... + 999259.

It is an arithmetic number, because the mean of its divisors is an integer number (5995494).

Almost surely, 2^21983467 is an apocalyptic number.

21983467 is a deficient number, since it is larger than the sum of its proper divisors (1998509).

21983467 is a wasteful number, since it uses less digits than its factorization.

21983467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998508.

The product of its digits is 72576, while the sum is 40.

The square root of 21983467 is about 4688.6530048618. The cubic root of 21983467 is about 280.1337243901.

Subtracting 21983467 from its reverse (76438912), we obtain a palindrome (54455445).

It can be divided in two parts, 219834 and 67, that multiplied together give a triangular number (14728878 = T₅₄₂₇).

The spelling of 21983467 in words is "twenty-one million, nine hundred eighty-three thousand, four hundred sixty-seven".