20221001021221 has 64 divisors (see below), whose sum is σ = 27706811328000. Its totient is φ = 14543076441600.

The previous prime is 20221001021209. The next prime is 20221001021237. The reversal of 20221001021221 is 12212010012202.

It is a happy number.

It is not a de Polignac number, because 20221001021221 - 2¹¹ = 20221001019173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221001021195 and 20221001021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221001021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 734200711 + ... + 734228251.

It is an arithmetic number, because the mean of its divisors is an integer number (432918927000).

Almost surely, 2^{20221001021221} is an apocalyptic number.

It is an amenable number.

20221001021221 is a deficient number, since it is larger than the sum of its proper divisors (7485810306779).

20221001021221 is a wasteful number, since it uses less digits than its factorization.

20221001021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42555 (or 42541 counting only the distinct ones).

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

Adding to 20221001021221 its reverse (12212010012202), we get a palindrome (32433011033423).

The spelling of 20221001021221 in words is "twenty trillion, two hundred twenty-one billion, one million, twenty-one thousand, two hundred twenty-one".