20221121221 has 16 divisors (see below), whose sum is σ = 23349513600. Its totient is φ = 17152804800.

The previous prime is 20221121197. The next prime is 20221121231. The reversal of 20221121221 is 12212112202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20221121221 - 2¹⁷ = 20220990149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221121195 and 20221121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1902895 + ... + 1913491.

It is an arithmetic number, because the mean of its divisors is an integer number (1459344600).

Almost surely, 2^20221121221 is an apocalyptic number.

It is an amenable number.

20221121221 is a deficient number, since it is larger than the sum of its proper divisors (3128392379).

20221121221 is a wasteful number, since it uses less digits than its factorization.

20221121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13404.

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

Adding to 20221121221 its reverse (12212112202), we get a palindrome (32433233423).

The spelling of 20221121221 in words is "twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".