21986201 has 8 divisors (see below), whose sum is σ = 22623744. Its totient is φ = 21354480.

The previous prime is 21986197. The next prime is 21986203. The reversal of 21986201 is 10268912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21986201 - 2² = 21986197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21986203) 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, 6875 + ... + 9551.

It is an arithmetic number, because the mean of its divisors is an integer number (2827968).

Almost surely, 2^21986201 is an apocalyptic number.

It is an amenable number.

21986201 is a deficient number, since it is larger than the sum of its proper divisors (637543).

21986201 is a wasteful number, since it uses less digits than its factorization.

21986201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 21986201 is about 4688.9445507491. The cubic root of 21986201 is about 280.1453369632.

The spelling of 21986201 in words is "twenty-one million, nine hundred eighty-six thousand, two hundred one".