21598942 has 8 divisors (see below), whose sum is σ = 34304256. Its totient is φ = 10164192.

The previous prime is 21598921. The next prime is 21598963. The reversal of 21598942 is 24989512.

It is an interprime number because it is at equal distance from previous prime (21598921) and next prime (21598963).

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 = 21598895 and 21598904.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 317598 + ... + 317665.

It is an arithmetic number, because the mean of its divisors is an integer number (4288032).

Almost surely, 2^21598942 is an apocalyptic number.

21598942 is a deficient number, since it is larger than the sum of its proper divisors (12705314).

21598942 is a wasteful number, since it uses less digits than its factorization.

21598942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635282.

The product of its digits is 51840, while the sum is 40.

The square root of 21598942 is about 4647.4661913778. The cubic root of 21598942 is about 278.4907829046.

The spelling of 21598942 in words is "twenty-one million, five hundred ninety-eight thousand, nine hundred forty-two".