21967198 has 16 divisors (see below), whose sum is σ = 36537840. Its totient is φ = 9820800.

The previous prime is 21967193. The next prime is 21967199. The reversal of 21967198 is 89176912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21967193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6843 + ... + 9526.

It is an arithmetic number, because the mean of its divisors is an integer number (2283615).

Almost surely, 2^21967198 is an apocalyptic number.

21967198 is a deficient number, since it is larger than the sum of its proper divisors (14570642).

21967198 is a wasteful number, since it uses less digits than its factorization.

21967198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16443.

The product of its digits is 54432, while the sum is 43.

The square root of 21967198 is about 4686.9177505051. The cubic root of 21967198 is about 280.0646024405.

The spelling of 21967198 in words is "twenty-one million, nine hundred sixty-seven thousand, one hundred ninety-eight".