1215404101121 has 12 divisors (see below), whose sum is σ = 1417294262340. Its totient is φ = 1039227799680.

The previous prime is 1215404101111. The next prime is 1215404101127. The reversal of 1215404101121 is 1211014045121.

It can be written as a sum of positive squares in 2 ways, for example, as 1176845280625 + 38558820496 = 1084825^2 + 196364^2 .

It is not a de Polignac number, because 1215404101121 - 2²⁶ = 1215336992257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215404101127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30302900 + ... + 30342981.

It is an arithmetic number, because the mean of its divisors is an integer number (118107855195).

Almost surely, 2^{1215404101121} is an apocalyptic number.

It is an amenable number.

1215404101121 is a deficient number, since it is larger than the sum of its proper divisors (201890161219).

1215404101121 is an equidigital number, since it uses as much as digits as its factorization.

1215404101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60646304 (or 60646297 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 1215404101121 its reverse (1211014045121), we get a palindrome (2426418146242).

The spelling of 1215404101121 in words is "one trillion, two hundred fifteen billion, four hundred four million, one hundred one thousand, one hundred twenty-one".