1221102415 has 16 divisors (see below), whose sum is σ = 1584608256. Its totient is φ = 897984000.

The previous prime is 1221102373. The next prime is 1221102419. The reversal of 1221102415 is 5142011221.

It is not a de Polignac number, because 1221102415 - 2⁷ = 1221102287 is a prime.

It is a super-2 number, since 2×1221102415² = 2982182215837664450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221102392 and 1221102401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221102419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23311 + ... + 54640.

It is an arithmetic number, because the mean of its divisors is an integer number (99038016).

Almost surely, 2^1221102415 is an apocalyptic number.

1221102415 is a deficient number, since it is larger than the sum of its proper divisors (363505841).

1221102415 is a wasteful number, since it uses less digits than its factorization.

1221102415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78210.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1221102415 is about 34944.2758545659. The cubic root of 1221102415 is about 1068.8514811244.

Adding to 1221102415 its reverse (5142011221), we get a palindrome (6363113636).

The spelling of 1221102415 in words is "one billion, two hundred twenty-one million, one hundred two thousand, four hundred fifteen".