21198006 has 12 divisors (see below), whose sum is σ = 45929052. Its totient is φ = 7065996.

The previous prime is 21197999. The next prime is 21198013. The reversal of 21198006 is 60089112.

It is an interprime number because it is at equal distance from previous prime (21197999) and next prime (21198013).

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 5 ways as a sum of consecutive naturals, for example, 588816 + ... + 588851.

It is an arithmetic number, because the mean of its divisors is an integer number (3827421).

Almost surely, 2^21198006 is an apocalyptic number.

21198006 is an abundant number, since it is smaller than the sum of its proper divisors (24731046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21198006 is a wasteful number, since it uses less digits than its factorization.

21198006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177675 (or 1177672 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 21198006 is about 4604.1292336337. The cubic root of 21198006 is about 276.7568232491.

The spelling of 21198006 in words is "twenty-one million, one hundred ninety-eight thousand, six".