1215104055520 has 48 divisors (see below), whose sum is σ = 2875837372128. Its totient is φ = 485168980480.

The previous prime is 1215104055509. The next prime is 1215104055541. The reversal of 1215104055520 is 255504015121.

It is a congruent number.

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, 6728116 + ... + 6906355.

It is an arithmetic number, because the mean of its divisors is an integer number (59913278586).

Almost surely, 2^{1215104055520} is an apocalyptic number.

1215104055520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215104055520 is an abundant number, since it is smaller than the sum of its proper divisors (1660733316608).

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

1215104055520 is a wasteful number, since it uses less digits than its factorization.

1215104055520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13635043 (or 13635035 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 1215104055520 in words is "one trillion, two hundred fifteen billion, one hundred four million, fifty-five thousand, five hundred twenty".