20120221 has 8 divisors (see below), whose sum is σ = 23104800. Its totient is φ = 17328240.

The previous prime is 20120213. The next prime is 20120237. The reversal of 20120221 is 12202102.

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 20120221 - 2³ = 20120213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120198 and 20120207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47926 + ... + 48343.

It is an arithmetic number, because the mean of its divisors is an integer number (2888100).

Almost surely, 2^20120221 is an apocalyptic number.

It is an amenable number.

20120221 is a deficient number, since it is larger than the sum of its proper divisors (2984579).

20120221 is a wasteful number, since it uses less digits than its factorization.

20120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96299.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20120221 is about 4485.5569330909. The cubic root of 20120221 is about 271.9845588481.

Adding to 20120221 its reverse (12202102), we get a palindrome (32322323).

The spelling of 20120221 in words is "twenty million, one hundred twenty thousand, two hundred twenty-one".