11415513545221 has 4 divisors (see below), whose sum is σ = 11419543026892. Its totient is φ = 11411484063552.

The previous prime is 11415513545179. The next prime is 11415513545257. The reversal of 11415513545221 is 12254531551411.

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 4938417285025 + 6477096260196 = 2222255^2 + 2545014^2 .

It is a cyclic number.

It is not a de Polignac number, because 11415513545221 - 2¹¹ = 11415513543173 is a prime.

It is a super-2 number, since 2×11415513545221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11415513545291) 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, 2014736586 + ... + 2014742251.

It is an arithmetic number, because the mean of its divisors is an integer number (2854885756723).

Almost surely, 2^{11415513545221} is an apocalyptic number.

It is an amenable number.

11415513545221 is a deficient number, since it is larger than the sum of its proper divisors (4029481671).

11415513545221 is an equidigital number, since it uses as much as digits as its factorization.

11415513545221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029481670.

The product of its digits is 120000, while the sum is 40.

The spelling of 11415513545221 in words is "eleven trillion, four hundred fifteen billion, five hundred thirteen million, five hundred forty-five thousand, two hundred twenty-one".