20011121223231 has 32 divisors (see below), whose sum is σ = 27251240421888. Its totient is φ = 13058451141120.

The previous prime is 20011121223179. The next prime is 20011121223257. The reversal of 20011121223231 is 13232212111002.

It is not a de Polignac number, because 20011121223231 - 2⁷ = 20011121223103 is a prime.

It is a super-2 number, since 2×20011121223231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20011121223198 and 20011121223207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011121227231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99022411 + ... + 99224291.

It is an arithmetic number, because the mean of its divisors is an integer number (851601263184).

Almost surely, 2^{20011121223231} is an apocalyptic number.

20011121223231 is a deficient number, since it is larger than the sum of its proper divisors (7240119198657).

20011121223231 is a wasteful number, since it uses less digits than its factorization.

20011121223231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205071.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 20011121223231 its reverse (13232212111002), we get a palindrome (33243333334233).

The spelling of 20011121223231 in words is "twenty trillion, eleven billion, one hundred twenty-one million, two hundred twenty-three thousand, two hundred thirty-one".