20111121012 has 12 divisors (see below), whose sum is σ = 46925949056. Its totient is φ = 6703707000.

The previous prime is 20111121001. The next prime is 20111121013. The reversal of 20111121012 is 21012111102.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1675926751 = 20111121012 / (2 + 0 + 1 + 1 + 1 + 1 + 2 + 1 + 0 + 1 + 2).

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 3 ways as a sum of consecutive naturals, for example, 837963364 + ... + 837963387.

Almost surely, 2^20111121012 is an apocalyptic number.

It is an amenable number.

20111121012 is an abundant number, since it is smaller than the sum of its proper divisors (26814828044).

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

20111121012 is a wasteful number, since it uses less digits than its factorization.

20111121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675926758 (or 1675926756 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20111121012 its reverse (21012111102), we get a palindrome (41123232114).

The spelling of 20111121012 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, twelve".