1156061221220 has 48 divisors (see below), whose sum is σ = 2479815813888. Its totient is φ = 452506548480.

The previous prime is 1156061221207. The next prime is 1156061221327. The reversal of 1156061221220 is 221221606511.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5423579 + ... + 5632701.

It is an arithmetic number, because the mean of its divisors is an integer number (51662829456).

Almost surely, 2^{1156061221220} is an apocalyptic number.

1156061221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156061221220 is an abundant number, since it is smaller than the sum of its proper divisors (1323754592668).

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

1156061221220 is a wasteful number, since it uses less digits than its factorization.

1156061221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215060 (or 215058 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 1156061221220 its reverse (221221606511), we get a palindrome (1377282827731).

The spelling of 1156061221220 in words is "one trillion, one hundred fifty-six billion, sixty-one million, two hundred twenty-one thousand, two hundred twenty".