21879334 has 4 divisors (see below), whose sum is σ = 32819004. Its totient is φ = 10939666.

The previous prime is 21879331. The next prime is 21879337. The reversal of 21879334 is 43397812.

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

It is an interprime number because it is at equal distance from previous prime (21879331) and next prime (21879337).

It is a junction number, because it is equal to n+sod(n) for n = 21879293 and 21879302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21879331) 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 as a sum of consecutive naturals, namely, 5469832 + ... + 5469835.

It is an arithmetic number, because the mean of its divisors is an integer number (8204751).

Almost surely, 2^21879334 is an apocalyptic number.

21879334 is a deficient number, since it is larger than the sum of its proper divisors (10939670).

21879334 is a wasteful number, since it uses less digits than its factorization.

21879334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10939669.

The product of its digits is 36288, while the sum is 37.

The square root of 21879334 is about 4677.5350346096. The cubic root of 21879334 is about 279.6907043878.

The spelling of 21879334 in words is "twenty-one million, eight hundred seventy-nine thousand, three hundred thirty-four".