1221141015 has 20 divisors (see below), whose sum is σ = 2189009064. Its totient is φ = 651274992.

The previous prime is 1221141011. The next prime is 1221141023. The reversal of 1221141015 is 5101411221.

It is not a de Polignac number, because 1221141015 - 2² = 1221141011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221141011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1507177 + ... + 1507986.

Almost surely, 2^1221141015 is an apocalyptic number.

1221141015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221141015 is a deficient number, since it is larger than the sum of its proper divisors (967868049).

1221141015 is an equidigital number, since it uses as much as digits as its factorization.

1221141015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015180 (or 3015171 counting only the distinct ones).

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

The square root of 1221141015 is about 34944.8281581123. The cubic root of 1221141015 is about 1068.8627434155.

Adding to 1221141015 its reverse (5101411221), we get a palindrome (6322552236).

The spelling of 1221141015 in words is "one billion, two hundred twenty-one million, one hundred forty-one thousand, fifteen".