202120211221 has 8 divisors (see below), whose sum is σ = 203591031840. Its totient is φ = 200649629712.

The previous prime is 202120211177. The next prime is 202120211263. The reversal of 202120211221 is 122112021202.

It is a happy number.

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 202120211221 - 2¹⁵ = 202120178453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202120211195 and 202120211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120211921) 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, 1860231 + ... + 1965883.

It is an arithmetic number, because the mean of its divisors is an integer number (25448878980).

Almost surely, 2^202120211221 is an apocalyptic number.

It is an amenable number.

202120211221 is a deficient number, since it is larger than the sum of its proper divisors (1470820619).

202120211221 is a wasteful number, since it uses less digits than its factorization.

202120211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119555.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202120211221 its reverse (122112021202), we get a palindrome (324232232423).

The spelling of 202120211221 in words is "two hundred two billion, one hundred twenty million, two hundred eleven thousand, two hundred twenty-one".