1015121320551 has 24 divisors (see below), whose sum is σ = 1599065948480. Its totient is φ = 616782568896.

The previous prime is 1015121320513. The next prime is 1015121320561. The reversal of 1015121320551 is 1550231215101.

It is a happy number.

1015121320551 is a `hidden beast` number, since 10 + 1 + 51 + 21 + 32 + 0 + 551 = 666.

It is not a de Polignac number, because 1015121320551 - 2¹⁸ = 1015121058407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1015121320561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54903736 + ... + 54922221.

Almost surely, 2^{1015121320551} is an apocalyptic number.

1015121320551 is a deficient number, since it is larger than the sum of its proper divisors (583944627929).

1015121320551 is a wasteful number, since it uses less digits than its factorization.

1015121320551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109826055 (or 109826052 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

Adding to 1015121320551 its reverse (1550231215101), we get a palindrome (2565352535652).

The spelling of 1015121320551 in words is "one trillion, fifteen billion, one hundred twenty-one million, three hundred twenty thousand, five hundred fifty-one".