1221015441 has 8 divisors (see below), whose sum is σ = 1636545024. Its totient is φ = 809748080.

The previous prime is 1221015427. The next prime is 1221015451. The reversal of 1221015441 is 1445101221.

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 1221015441 - 2⁵ = 1221015409 is a prime.

It is a super-3 number, since 3×1221015441³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221015451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064886 + ... + 1066031.

It is an arithmetic number, because the mean of its divisors is an integer number (204568128).

Almost surely, 2^1221015441 is an apocalyptic number.

It is an amenable number.

1221015441 is a deficient number, since it is larger than the sum of its proper divisors (415529583).

1221015441 is a wasteful number, since it uses less digits than its factorization.

1221015441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131111.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1221015441 is about 34943.0313653524. The cubic root of 1221015441 is about 1068.8261039203.

Adding to 1221015441 its reverse (1445101221), we get a palindrome (2666116662).

The spelling of 1221015441 in words is "one billion, two hundred twenty-one million, fifteen thousand, four hundred forty-one".