202122212021 has 8 divisors (see below), whose sum is σ = 220096783200. Its totient is φ = 184881296880.

The previous prime is 202122211961. The next prime is 202122212069. The reversal of 202122212021 is 120212221202.

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 a de Polignac number, because none of the positive numbers 2^k-202122212021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122217021) 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, 183413435 + ... + 183414536.

It is an arithmetic number, because the mean of its divisors is an integer number (27512097900).

Almost surely, 2^202122212021 is an apocalyptic number.

It is an amenable number.

202122212021 is a deficient number, since it is larger than the sum of its proper divisors (17974571179).

202122212021 is a wasteful number, since it uses less digits than its factorization.

202122212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366828019.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202122212021 its reverse (120212221202), we get a palindrome (322334433223).

The spelling of 202122212021 in words is "two hundred two billion, one hundred twenty-two million, two hundred twelve thousand, twenty-one".