21301786221 has 8 divisors (see below), whose sum is σ = 28403454240. Its totient is φ = 14200654512.

The previous prime is 21301786189. The next prime is 21301786249. The reversal of 21301786221 is 12268710312.

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

It is not a de Polignac number, because 21301786221 - 2⁵ = 21301786189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301786021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29815 + ... + 208548.

It is an arithmetic number, because the mean of its divisors is an integer number (3550431780).

Almost surely, 2^21301786221 is an apocalyptic number.

It is an amenable number.

21301786221 is a deficient number, since it is larger than the sum of its proper divisors (7101668019).

21301786221 is a wasteful number, since it uses less digits than its factorization.

21301786221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268155.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 21301786221 in words is "twenty-one billion, three hundred one million, seven hundred eighty-six thousand, two hundred twenty-one".