1215053440000 has 110 divisors (see below), whose sum is σ = 3035180411054. Its totient is φ = 486021120000.

The previous prime is 1215053439961. The next prime is 1215053440049. The reversal of 1215053440000 is 443505121.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 207294447616 + 1007758992384 = 455296^2 + 1003872^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 309261 + ... + 1589260.

Almost surely, 2^{1215053440000} is an apocalyptic number.

1215053440000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215053440000 is an abundant number, since it is smaller than the sum of its proper divisors (1820126971054).

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

1215053440000 is an frugal number, since it uses more digits than its factorization.

1215053440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898561 (or 1898528 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 1215053440000 its reverse (443505121), we get a palindrome (1215496945121).

The spelling of 1215053440000 in words is "one trillion, two hundred fifteen billion, fifty-three million, four hundred forty thousand".