1221552103056 has 40 divisors (see below), whose sum is σ = 3167320861824. Its totient is φ = 405681505920.

The previous prime is 1221552103027. The next prime is 1221552103067. The reversal of 1221552103056 is 6503012551221.

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, 46940871 + ... + 46966886.

Almost surely, 2^{1221552103056} is an apocalyptic number.

1221552103056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1221552103056 is an abundant number, since it is smaller than the sum of its proper divisors (1945768758768).

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

1221552103056 is a wasteful number, since it uses less digits than its factorization.

1221552103056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93908039 (or 93908033 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 1221552103056 its reverse (6503012551221), we get a palindrome (7724564654277).

The spelling of 1221552103056 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-two million, one hundred three thousand, fifty-six".