21198136 has 16 divisors (see below), whose sum is σ = 39835440. Its totient is φ = 10575360.

The previous prime is 21198127. The next prime is 21198137. The reversal of 21198136 is 63189112.

It is a junction number, because it is equal to n+sod(n) for n = 21198098 and 21198107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21198137) 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, 1176 + ... + 6616.

It is an arithmetic number, because the mean of its divisors is an integer number (2489715).

Almost surely, 2^21198136 is an apocalyptic number.

It is an amenable number.

21198136 is a deficient number, since it is larger than the sum of its proper divisors (18637304).

21198136 is a wasteful number, since it uses less digits than its factorization.

21198136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5934 (or 5930 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 21198136 is about 4604.1433513738. The cubic root of 21198136 is about 276.7573889991.

The spelling of 21198136 in words is "twenty-one million, one hundred ninety-eight thousand, one hundred thirty-six".