1221115410 has 48 divisors (see below), whose sum is σ = 3180340800. Its totient is φ = 325072800.

The previous prime is 1221115409. The next prime is 1221115411. The reversal of 1221115410 is 145111221.

1221115410 is a `hidden beast` number, since 12 + 2 + 111 + 541 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1221115409) and next prime (1221115411).

It is a super-2 number, since 2×1221115410² = 2982245689078936200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1221115411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42585 + ... + 65235.

It is an arithmetic number, because the mean of its divisors is an integer number (66257100).

Almost surely, 2^1221115410 is an apocalyptic number.

1221115410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221115410 is an abundant number, since it is smaller than the sum of its proper divisors (1959225390).

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

1221115410 is a wasteful number, since it uses less digits than its factorization.

1221115410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23263 (or 23260 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1221115410 is about 34944.4617929651. The cubic root of 1221115410 is about 1068.8552726917.

Adding to 1221115410 its reverse (145111221), we get a palindrome (1366226631).

The spelling of 1221115410 in words is "one billion, two hundred twenty-one million, one hundred fifteen thousand, four hundred ten".