1221121041 has 8 divisors (see below), whose sum is σ = 1860755904. Its totient is φ = 697783440.

The previous prime is 1221121039. The next prime is 1221121043. The reversal of 1221121041 is 1401211221.

It is an interprime number because it is at equal distance from previous prime (1221121039) and next prime (1221121043).

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

It is not a de Polignac number, because 1221121041 - 2¹ = 1221121039 is a prime.

It is a super-2 number, since 2×1221121041² = 2982273193545847362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221121041.

It is not an unprimeable number, because it can be changed into a prime (1221121043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29074290 + ... + 29074331.

It is an arithmetic number, because the mean of its divisors is an integer number (232594488).

Almost surely, 2^1221121041 is an apocalyptic number.

It is an amenable number.

1221121041 is a deficient number, since it is larger than the sum of its proper divisors (639634863).

1221121041 is an equidigital number, since it uses as much as digits as its factorization.

1221121041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58148631.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1221121041 is about 34944.5423635795. The cubic root of 1221121041 is about 1068.8569156472.

Adding to 1221121041 its reverse (1401211221), we get a palindrome (2622332262).

The spelling of 1221121041 in words is "one billion, two hundred twenty-one million, one hundred twenty-one thousand, forty-one".