121111111010020 has 12 divisors (see below), whose sum is σ = 254333333121084. Its totient is φ = 48444444404000.

The previous prime is 121111111010009. The next prime is 121111111010023. The reversal of 121111111010020 is 20010111111121.

It can be written as a sum of positive squares in 2 ways, for example, as 87859465262244 + 33251645747776 = 9373338^2 + 5766424^2 .

It is not an unprimeable number, because it can be changed into a prime (121111111010023) 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, 3027777775231 + ... + 3027777775270.

It is an arithmetic number, because the mean of its divisors is an integer number (21194444426757).

Almost surely, 2^{121111111010020} is an apocalyptic number.

121111111010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111111010020 is an abundant number, since it is smaller than the sum of its proper divisors (133222222111064).

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

121111111010020 is a wasteful number, since it uses less digits than its factorization.

121111111010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6055555550510 (or 6055555550508 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 121111111010020 its reverse (20010111111121), we get a palindrome (141121222121141).

The spelling of 121111111010020 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, ten thousand, twenty".