1215212431543 has 4 divisors (see below), whose sum is σ = 1325686288968. Its totient is φ = 1104738574120.

The previous prime is 1215212431493. The next prime is 1215212431561. The reversal of 1215212431543 is 3451342125121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1215212431543 - 2²¹ = 1215210334391 is a prime.

It is a super-2 number, since 2×1215212431543² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1215212431499 and 1215212431508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215212431583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55236928696 + ... + 55236928717.

It is an arithmetic number, because the mean of its divisors is an integer number (331421572242).

Almost surely, 2^{1215212431543} is an apocalyptic number.

1215212431543 is a deficient number, since it is larger than the sum of its proper divisors (110473857425).

1215212431543 is a wasteful number, since it uses less digits than its factorization.

1215212431543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110473857424.

The product of its digits is 28800, while the sum is 34.

Adding to 1215212431543 its reverse (3451342125121), we get a palindrome (4666554556664).

The spelling of 1215212431543 in words is "one trillion, two hundred fifteen billion, two hundred twelve million, four hundred thirty-one thousand, five hundred forty-three".