1241212121720 has 128 divisors (see below), whose sum is σ = 2888234979840. Its totient is φ = 479704135680.

The previous prime is 1241212121713. The next prime is 1241212121771. The reversal of 1241212121720 is 271212121421.

It is a super-2 number, since 2×1241212121720² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1241212121720.

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 31 ways as a sum of consecutive naturals, for example, 138942374 + ... + 138951306.

It is an arithmetic number, because the mean of its divisors is an integer number (22564335780).

Almost surely, 2^{1241212121720} is an apocalyptic number.

1241212121720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1241212121720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444117489920).

1241212121720 is an abundant number, since it is smaller than the sum of its proper divisors (1647022858120).

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

1241212121720 is a wasteful number, since it uses less digits than its factorization.

1241212121720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9625 (or 9621 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The spelling of 1241212121720 in words is "one trillion, two hundred forty-one billion, two hundred twelve million, one hundred twenty-one thousand, seven hundred twenty".