20111121016 has 32 divisors (see below), whose sum is σ = 43174982880. Its totient is φ = 8603107200.

The previous prime is 20111121013. The next prime is 20111121047. The reversal of 20111121016 is 61012111102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111121013) 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, 301615 + ... + 362206.

It is an arithmetic number, because the mean of its divisors is an integer number (1349218215).

Almost surely, 2^20111121016 is an apocalyptic number.

It is an amenable number.

20111121016 is an abundant number, since it is smaller than the sum of its proper divisors (23063861864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111121016 is a wasteful number, since it uses less digits than its factorization.

20111121016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664375 (or 664371 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 20111121016 its reverse (61012111102), we get a palindrome (81123232118).

The spelling of 20111121016 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, sixteen".