1155151401221 has 8 divisors (see below), whose sum is σ = 1176971007384. Its totient is φ = 1133332695040.

The previous prime is 1155151401197. The next prime is 1155151401223. The reversal of 1155151401221 is 1221041515511.

It can be written as a sum of positive squares in 4 ways, for example, as 690178792900 + 464972608321 = 830770^2 + 681889^2 .

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 1155151401221 - 2²⁶ = 1155084292357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155151401223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2729141 + ... + 3123861.

It is an arithmetic number, because the mean of its divisors is an integer number (147121375923).

Almost surely, 2^{1155151401221} is an apocalyptic number.

It is an amenable number.

1155151401221 is a deficient number, since it is larger than the sum of its proper divisors (21819606163).

1155151401221 is an equidigital number, since it uses as much as digits as its factorization.

1155151401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449991.

The product of its (nonzero) digits is 2000, while the sum is 29.

Adding to 1155151401221 its reverse (1221041515511), we get a palindrome (2376192916732).

The spelling of 1155151401221 in words is "one trillion, one hundred fifty-five billion, one hundred fifty-one million, four hundred one thousand, two hundred twenty-one".