21369598 has 4 divisors (see below), whose sum is σ = 32054400. Its totient is φ = 10684798.

The previous prime is 21369589. The next prime is 21369617. The reversal of 21369598 is 89596312.

It is a happy number.

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

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 as a sum of consecutive naturals, namely, 5342398 + ... + 5342401.

It is an arithmetic number, because the mean of its divisors is an integer number (8013600).

Almost surely, 2^21369598 is an apocalyptic number.

21369598 is a deficient number, since it is larger than the sum of its proper divisors (10684802).

21369598 is a wasteful number, since it uses less digits than its factorization.

21369598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10684801.

The product of its digits is 116640, while the sum is 43.

The square root of 21369598 is about 4622.7262518994. The cubic root of 21369598 is about 277.5015739975.

The spelling of 21369598 in words is "twenty-one million, three hundred sixty-nine thousand, five hundred ninety-eight".