1521154121055 has 64 divisors (see below), whose sum is σ = 2488482501120. Its totient is φ = 793287323136.

The previous prime is 1521154121041. The next prime is 1521154121093. The reversal of 1521154121055 is 5501214511251.

It is a happy number.

It is not a de Polignac number, because 1521154121055 - 2⁵ = 1521154121023 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 135292264 + ... + 135303506.

It is an arithmetic number, because the mean of its divisors is an integer number (38882539080).

Almost surely, 2^{1521154121055} is an apocalyptic number.

1521154121055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1521154121055 is a deficient number, since it is larger than the sum of its proper divisors (967328380065).

1521154121055 is a wasteful number, since it uses less digits than its factorization.

1521154121055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12440.

The product of its (nonzero) digits is 10000, while the sum is 33.

The spelling of 1521154121055 in words is "one trillion, five hundred twenty-one billion, one hundred fifty-four million, one hundred twenty-one thousand, fifty-five".