21596942 has 4 divisors (see below), whose sum is σ = 32395416. Its totient is φ = 10798470.

The previous prime is 21596921. The next prime is 21596951. The reversal of 21596942 is 24969512.

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

It is a junction number, because it is equal to n+sod(n) for n = 21596896 and 21596905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5399234 + ... + 5399237.

It is an arithmetic number, because the mean of its divisors is an integer number (8098854).

Almost surely, 2^21596942 is an apocalyptic number.

21596942 is a deficient number, since it is larger than the sum of its proper divisors (10798474).

21596942 is a wasteful number, since it uses less digits than its factorization.

21596942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10798473.

The product of its digits is 38880, while the sum is 38.

The square root of 21596942 is about 4647.2510153853. The cubic root of 21596942 is about 278.4821868237.

The spelling of 21596942 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred forty-two".