202120221 has 8 divisors (see below), whose sum is σ = 269562400. Its totient is φ = 134712432.

The previous prime is 202120187. The next prime is 202120249. The reversal of 202120221 is 122021202.

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

It is not a de Polignac number, because 202120221 - 2²³ = 193731613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202120197 and 202120206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120421) 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, 12555 + ... + 23703.

It is an arithmetic number, because the mean of its divisors is an integer number (33695300).

Almost surely, 2^202120221 is an apocalyptic number.

It is an amenable number.

202120221 is a deficient number, since it is larger than the sum of its proper divisors (67442179).

202120221 is a wasteful number, since it uses less digits than its factorization.

202120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17195.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 202120221 is about 14216.8991344808. The cubic root of 202120221 is about 586.8628091502.

Adding to 202120221 its reverse (122021202), we get a palindrome (324141423).

The spelling of 202120221 in words is "two hundred two million, one hundred twenty thousand, two hundred twenty-one".