21986061 has 8 divisors (see below), whose sum is σ = 29443680. Its totient is φ = 14592912.

The previous prime is 21986057. The next prime is 21986077. The reversal of 21986061 is 16068912.

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

It is not a de Polignac number, because 21986061 - 2² = 21986057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21906061) 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, 15315 + ... + 16688.

It is an arithmetic number, because the mean of its divisors is an integer number (3680460).

Almost surely, 2^21986061 is an apocalyptic number.

It is an amenable number.

21986061 is a deficient number, since it is larger than the sum of its proper divisors (7457619).

21986061 is a wasteful number, since it uses less digits than its factorization.

21986061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32235.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 21986061 is about 4688.9296219926. The cubic root of 21986061 is about 280.1447423413.

The spelling of 21986061 in words is "twenty-one million, nine hundred eighty-six thousand, sixty-one".