20149221 has 8 divisors (see below), whose sum is σ = 26897184. Its totient is φ = 13417040.

The previous prime is 20149211. The next prime is 20149237. The reversal of 20149221 is 12294102.

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 20149221 - 2⁵ = 20149189 is a prime.

It is a super-2 number, since 2×20149221² = 811982213813682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20149211) 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, 546 + ... + 6371.

It is an arithmetic number, because the mean of its divisors is an integer number (3362148).

Almost surely, 2^20149221 is an apocalyptic number.

It is an amenable number.

20149221 is a deficient number, since it is larger than the sum of its proper divisors (6747963).

20149221 is an equidigital number, since it uses as much as digits as its factorization.

20149221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7891.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20149221 is about 4488.7883665862. The cubic root of 20149221 is about 272.1151698339.

The spelling of 20149221 in words is "twenty million, one hundred forty-nine thousand, two hundred twenty-one".