1554115004221 has 4 divisors (see below), whose sum is σ = 1673662312252. Its totient is φ = 1434567696192.

The previous prime is 1554115004219. The next prime is 1554115004257. The reversal of 1554115004221 is 1224005114551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 911287888996 + 642827115225 = 954614^2 + 801765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1554115004221 - 2¹ = 1554115004219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1554115004521) 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, 59773653996 + ... + 59773654021.

It is an arithmetic number, because the mean of its divisors is an integer number (418415578063).

Almost surely, 2^{1554115004221} is an apocalyptic number.

It is an amenable number.

1554115004221 is a deficient number, since it is larger than the sum of its proper divisors (119547308031).

1554115004221 is a wasteful number, since it uses less digits than its factorization.

1554115004221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119547308030.

The product of its (nonzero) digits is 8000, while the sum is 31.

The spelling of 1554115004221 in words is "one trillion, five hundred fifty-four billion, one hundred fifteen million, four thousand, two hundred twenty-one".