2153651336521 has 4 divisors (see below), whose sum is σ = 2153678174100. Its totient is φ = 2153624498944.

The previous prime is 2153651336497. The next prime is 2153651336537. The reversal of 2153651336521 is 1256331563512.

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 1935893780496 + 217757556025 = 1391364^2 + 466645^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153651336521 - 2⁵ = 2153651336489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2153651346521) 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, 13298056 + ... + 13459033.

It is an arithmetic number, because the mean of its divisors is an integer number (538419543525).

Almost surely, 2^{2153651336521} is an apocalyptic number.

It is an amenable number.

2153651336521 is a deficient number, since it is larger than the sum of its proper divisors (26837579).

2153651336521 is an equidigital number, since it uses as much as digits as its factorization.

2153651336521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26837578.

The product of its digits is 486000, while the sum is 43.

The spelling of 2153651336521 in words is "two trillion, one hundred fifty-three billion, six hundred fifty-one million, three hundred thirty-six thousand, five hundred twenty-one".