20221221111221 has 8 divisors (see below), whose sum is σ = 21791227164000. Its totient is φ = 18653290416432.

The previous prime is 20221221111211. The next prime is 20221221111253. The reversal of 20221221111221 is 12211112212202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20221221111221 - 2¹⁰ = 20221221110197 is a prime.

It is a super-2 number, since 2×20221221111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20221221111193 and 20221221111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221221111211) 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, 518819255 + ... + 518858228.

It is an arithmetic number, because the mean of its divisors is an integer number (2723903395500).

Almost surely, 2^{20221221111221} is an apocalyptic number.

It is an amenable number.

20221221111221 is a deficient number, since it is larger than the sum of its proper divisors (1570006052779).

20221221111221 is a wasteful number, since it uses less digits than its factorization.

20221221111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037678995.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20221221111221 its reverse (12211112212202), we get a palindrome (32432333323423).

The spelling of 20221221111221 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".