21938012 has 6 divisors (see below), whose sum is σ = 38391528. Its totient is φ = 10969004.

The previous prime is 21938009. The next prime is 21938023. The reversal of 21938012 is 21083912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2742248 + ... + 2742255.

It is an arithmetic number, because the mean of its divisors is an integer number (6398588).

Almost surely, 2^21938012 is an apocalyptic number.

It is an amenable number.

21938012 is a deficient number, since it is larger than the sum of its proper divisors (16453516).

21938012 is a wasteful number, since it uses less digits than its factorization.

21938012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5484507 (or 5484505 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21938012 is about 4683.8031555564. The cubic root of 21938012 is about 279.9405145742.

The spelling of 21938012 in words is "twenty-one million, nine hundred thirty-eight thousand, twelve".