1211211020120 has 32 divisors (see below), whose sum is σ = 2750694195600. Its totient is φ = 479956514688.

The previous prime is 1211211020111. The next prime is 1211211020137. The reversal of 1211211020120 is 210201121121.

It is a junction number, because it is equal to n+sod(n) for n = 1211211020095 and 1211211020104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141492335 + ... + 141500894.

Almost surely, 2^{1211211020120} is an apocalyptic number.

1211211020120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211211020120 is an abundant number, since it is smaller than the sum of its proper divisors (1539483175480).

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

1211211020120 is a wasteful number, since it uses less digits than its factorization.

1211211020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282993347 (or 282993343 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211211020120 its reverse (210201121121), we get a palindrome (1421412141241).

The spelling of 1211211020120 in words is "one trillion, two hundred eleven billion, two hundred eleven million, twenty thousand, one hundred twenty".