20122001221 has 8 divisors (see below), whose sum is σ = 23091996224. Its totient is φ = 17175862080.

The previous prime is 20122001213. The next prime is 20122001233. The reversal of 20122001221 is 12210022102.

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 not a de Polignac number, because 20122001221 - 2³ = 20122001213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122001021) 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, 5962155 + ... + 5965528.

It is an arithmetic number, because the mean of its divisors is an integer number (2886499528).

Almost surely, 2^20122001221 is an apocalyptic number.

It is an amenable number.

20122001221 is a deficient number, since it is larger than the sum of its proper divisors (2969995003).

20122001221 is a wasteful number, since it uses less digits than its factorization.

20122001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11927931.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20122001221 its reverse (12210022102), we get a palindrome (32332023323).

The spelling of 20122001221 in words is "twenty billion, one hundred twenty-two million, one thousand, two hundred twenty-one".