20212221120121 has 16 divisors (see below), whose sum is σ = 20543974133760. Its totient is φ = 19882621098000.

The previous prime is 20212221120103. The next prime is 20212221120137. The reversal of 20212221120121 is 12102112221202.

It is a cyclic number.

It is not a de Polignac number, because 20212221120121 - 2⁴¹ = 18013197864569 is a prime.

It is a super-2 number, since 2×20212221120121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212221100121) 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, 63987256 + ... + 64302358.

It is an arithmetic number, because the mean of its divisors is an integer number (1283998383360).

Almost surely, 2^{20212221120121} is an apocalyptic number.

It is an amenable number.

20212221120121 is a deficient number, since it is larger than the sum of its proper divisors (331753013639).

20212221120121 is a wasteful number, since it uses less digits than its factorization.

20212221120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318516.

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

Adding to 20212221120121 its reverse (12102112221202), we get a palindrome (32314333341323).

The spelling of 20212221120121 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".