20111121031 has 8 divisors (see below), whose sum is σ = 20163553200. Its totient is φ = 20058717312.

The previous prime is 20111121013. The next prime is 20111121047. The reversal of 20111121031 is 13012111102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20111121031 - 2²³ = 20102732423 is a prime.

It is a super-2 number, since 2×20111121031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111121001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2526045 + ... + 2533993.

It is an arithmetic number, because the mean of its divisors is an integer number (2520444150).

Almost surely, 2^20111121031 is an apocalyptic number.

20111121031 is a deficient number, since it is larger than the sum of its proper divisors (52432169).

20111121031 is an equidigital number, since it uses as much as digits as its factorization.

20111121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14225.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20111121031 its reverse (13012111102), we get a palindrome (33123232133).

The spelling of 20111121031 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, thirty-one".