202221212021 has 8 divisors (see below), whose sum is σ = 214126597440. Its totient is φ = 190316939968.

The previous prime is 202221211979. The next prime is 202221212023. The reversal of 202221212021 is 120212122202.

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-202221212021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221212023) 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, 111200 + ... + 645606.

It is an arithmetic number, because the mean of its divisors is an integer number (26765824680).

Almost surely, 2^202221212021 is an apocalyptic number.

It is an amenable number.

202221212021 is a deficient number, since it is larger than the sum of its proper divisors (11905385419).

202221212021 is a wasteful number, since it uses less digits than its factorization.

202221212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556683.

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

Adding to 202221212021 its reverse (120212122202), we get a palindrome (322433334223).

The spelling of 202221212021 in words is "two hundred two billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".