20111433121 has 16 divisors (see below), whose sum is σ = 22274771904. Its totient is φ = 18040526784.

The previous prime is 20111433113. The next prime is 20111433131. The reversal of 20111433121 is 12133411102.

It is a cyclic number.

It is not a de Polignac number, because 20111433121 - 2³ = 20111433113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111433131) 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, 18810 + ... + 201436.

It is an arithmetic number, because the mean of its divisors is an integer number (1392173244).

Almost surely, 2^20111433121 is an apocalyptic number.

It is an amenable number.

20111433121 is a deficient number, since it is larger than the sum of its proper divisors (2163338783).

20111433121 is a wasteful number, since it uses less digits than its factorization.

20111433121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182880.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20111433121 its reverse (12133411102), we get a palindrome (32244844223).

The spelling of 20111433121 in words is "twenty billion, one hundred eleven million, four hundred thirty-three thousand, one hundred twenty-one".