21194938 has 8 divisors (see below), whose sum is σ = 32313780. Its totient is φ = 10423680.

The previous prime is 21194933. The next prime is 21194959. The reversal of 21194938 is 83949112.

It can be written as a sum of positive squares in 2 ways, for example, as 15468489 + 5726449 = 3933^2 + 2393^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21194897 and 21194906.

It is not an unprimeable number, because it can be changed into a prime (21194933) 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, 86743 + ... + 86986.

Almost surely, 2^21194938 is an apocalyptic number.

21194938 is a deficient number, since it is larger than the sum of its proper divisors (11118842).

21194938 is a wasteful number, since it uses less digits than its factorization.

21194938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173792.

The product of its digits is 15552, while the sum is 37.

The square root of 21194938 is about 4603.7960423981. The cubic root of 21194938 is about 276.7434708785.

The spelling of 21194938 in words is "twenty-one million, one hundred ninety-four thousand, nine hundred thirty-eight".