1221511150515 has 16 divisors (see below), whose sum is σ = 1955897371296. Its totient is φ = 650979436800.

The previous prime is 1221511150501. The next prime is 1221511150571. The reversal of 1221511150515 is 5150511151221.

It is not a de Polignac number, because 1221511150515 - 2¹⁰ = 1221511149491 is a prime.

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, 30803076 + ... + 30842705.

It is an arithmetic number, because the mean of its divisors is an integer number (122243585706).

Almost surely, 2^{1221511150515} is an apocalyptic number.

1221511150515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221511150515 is a deficient number, since it is larger than the sum of its proper divisors (734386220781).

1221511150515 is a wasteful number, since it uses less digits than its factorization.

1221511150515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61647110.

The product of its (nonzero) digits is 2500, while the sum is 30.

The spelling of 1221511150515 in words is "one trillion, two hundred twenty-one billion, five hundred eleven million, one hundred fifty thousand, five hundred fifteen".