20122121210221 has 16 divisors (see below), whose sum is σ = 21273724158336. Its totient is φ = 18995041010176.

The previous prime is 20122121210207. The next prime is 20122121210287. The reversal of 20122121210221 is 12201212122102.

It is a cyclic number.

It is not a de Polignac number, because 20122121210221 - 2¹⁷ = 20122121079149 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 (20122121217221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16008715 + ... + 17219848.

It is an arithmetic number, because the mean of its divisors is an integer number (1329607759896).

Almost surely, 2^{20122121210221} is an apocalyptic number.

It is an amenable number.

20122121210221 is a deficient number, since it is larger than the sum of its proper divisors (1151602948115).

20122121210221 is a wasteful number, since it uses less digits than its factorization.

20122121210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33228932.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20122121210221 its reverse (12201212122102), we get a palindrome (32323333332323).

The spelling of 20122121210221 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".