21883679 has 2 divisors, whose sum is σ = 21883680. Its totient is φ = 21883678.

The previous prime is 21883663. The next prime is 21883699. The reversal of 21883679 is 97638812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21883679 - 2⁴ = 21883663 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21883619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10941839 + 10941840.

It is an arithmetic number, because the mean of its divisors is an integer number (10941840).

Almost surely, 2^21883679 is an apocalyptic number.

21883679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21883679 is an equidigital number, since it uses as much as digits as its factorization.

21883679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 21883679 is about 4677.9994655836. Note that the first 3 decimals coincide. The cubic root of 21883679 is about 279.7092176825.

The spelling of 21883679 in words is "twenty-one million, eight hundred eighty-three thousand, six hundred seventy-nine".