1221055311040 has 56 divisors (see below), whose sum is σ = 2907745438752. Its totient is φ = 488404070400.

The previous prime is 1221055311029. The next prime is 1221055311067. The reversal of 1221055311040 is 401135501221.

It is a super-2 number, since 2×1221055311040² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221055310996 and 1221055311014.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11626765 + ... + 11731315.

It is an arithmetic number, because the mean of its divisors is an integer number (51924025692).

Almost surely, 2^{1221055311040} is an apocalyptic number.

1221055311040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221055311040 is an abundant number, since it is smaller than the sum of its proper divisors (1686690127712).

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

1221055311040 is a wasteful number, since it uses less digits than its factorization.

1221055311040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141065 (or 141055 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 1221055311040 in words is "one trillion, two hundred twenty-one billion, fifty-five million, three hundred eleven thousand, forty".