1215121064274 has 128 divisors (see below), whose sum is σ = 2942430624000. Its totient is φ = 369459408384.

The previous prime is 1215121064273. The next prime is 1215121064281. The reversal of 1215121064274 is 4724601215121.

1215121064274 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 1 + 2 + 1 + 0 + 642 + 7 + 4 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1215121064273) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 124763697 + ... + 124773435.

It is an arithmetic number, because the mean of its divisors is an integer number (22987739250).

Almost surely, 2^{1215121064274} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215121064274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471215312000).

1215121064274 is an abundant number, since it is smaller than the sum of its proper divisors (1727309559726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215121064274 is a wasteful number, since it uses less digits than its factorization.

1215121064274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11849 (or 11843 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

Adding to 1215121064274 its reverse (4724601215121), we get a palindrome (5939722279395).

The spelling of 1215121064274 in words is "one trillion, two hundred fifteen billion, one hundred twenty-one million, sixty-four thousand, two hundred seventy-four".