1212111111020 has 24 divisors (see below), whose sum is σ = 2627544087168. Its totient is φ = 469204300800.

The previous prime is 1212111111007. The next prime is 1212111111023. The reversal of 1212111111020 is 201111112121.

It is a junction number, because it is equal to n+sod(n) for n = 1212111110986 and 1212111111004.

It is not an unprimeable number, because it can be changed into a prime (1212111111023) 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, 977508341 + ... + 977509580.

It is an arithmetic number, because the mean of its divisors is an integer number (109481003632).

Almost surely, 2^{1212111111020} is an apocalyptic number.

1212111111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212111111020 is an abundant number, since it is smaller than the sum of its proper divisors (1415432976148).

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

1212111111020 is a wasteful number, since it uses less digits than its factorization.

1212111111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955017961 (or 1955017959 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1212111111020 its reverse (201111112121), we get a palindrome (1413222223141).

The spelling of 1212111111020 in words is "one trillion, two hundred twelve billion, one hundred eleven million, one hundred eleven thousand, twenty".