202021222221 has 192 divisors, whose sum is σ = 375854169600. Its totient is φ = 101734963200.

The previous prime is 202021222201. The next prime is 202021222231. The reversal of 202021222221 is 122222120202.

202021222221 is a `hidden beast` number, since 20 + 202 + 1 + 222 + 221 = 666.

It is not a de Polignac number, because 202021222221 - 2¹³ = 202021214029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202021222194 and 202021222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202021222201) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 456029626 + ... + 456030068.

It is an arithmetic number, because the mean of its divisors is an integer number (1957573800).

Almost surely, 2^202021222221 is an apocalyptic number.

202021222221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202021222221 is a deficient number, since it is larger than the sum of its proper divisors (173832947379).

202021222221 is a wasteful number, since it uses less digits than its factorization.

202021222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 202021222221 its reverse (122222120202), we get a palindrome (324243342423).

The spelling of 202021222221 in words is "two hundred two billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".