121111211020 has 12 divisors (see below), whose sum is σ = 254333543184. Its totient is φ = 48444484400.

The previous prime is 121111211009. The next prime is 121111211047. The reversal of 121111211020 is 20112111121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3027780256 + ... + 3027780295.

It is an arithmetic number, because the mean of its divisors is an integer number (21194461932).

Almost surely, 2^121111211020 is an apocalyptic number.

121111211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111211020 is an abundant number, since it is smaller than the sum of its proper divisors (133222332164).

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

121111211020 is a wasteful number, since it uses less digits than its factorization.

121111211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6055560560 (or 6055560558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121111211020 its reverse (20112111121), we get a palindrome (141223322141).

The spelling of 121111211020 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred eleven thousand, twenty".