1221550345415 has 8 divisors (see below), whose sum is σ = 1466755879680. Its totient is φ = 976643299552.

The previous prime is 1221550345399. The next prime is 1221550345429. The reversal of 1221550345415 is 5145430551221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221550345415 - 2⁴ = 1221550345399 is a prime.

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, 74613095 + ... + 74629464.

It is an arithmetic number, because the mean of its divisors is an integer number (183344484960).

Almost surely, 2^{1221550345415} is an apocalyptic number.

1221550345415 is a deficient number, since it is larger than the sum of its proper divisors (245205534265).

1221550345415 is a wasteful number, since it uses less digits than its factorization.

1221550345415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149244201.

The product of its (nonzero) digits is 120000, while the sum is 38.

Adding to 1221550345415 its reverse (5145430551221), we get a palindrome (6366980896636).

The spelling of 1221550345415 in words is "one trillion, two hundred twenty-one billion, five hundred fifty million, three hundred forty-five thousand, four hundred fifteen".