20011220001121 has 16 divisors (see below), whose sum is σ = 20932095582720. Its totient is φ = 19094614876480.

The previous prime is 20011220001107. The next prime is 20011220001131. The reversal of 20011220001121 is 12110002211002.

It is a cyclic number.

It is not a de Polignac number, because 20011220001121 - 2¹⁵ = 20011219968353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011220001131) 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, 24665496 + ... + 25463878.

It is an arithmetic number, because the mean of its divisors is an integer number (1308255973920).

Almost surely, 2^{20011220001121} is an apocalyptic number.

It is an amenable number.

20011220001121 is a deficient number, since it is larger than the sum of its proper divisors (920875581599).

20011220001121 is a wasteful number, since it uses less digits than its factorization.

20011220001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801056.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20011220001121 its reverse (12110002211002), we get a palindrome (32121222212123).

The spelling of 20011220001121 in words is "twenty trillion, eleven billion, two hundred twenty million, one thousand, one hundred twenty-one".