11521075621394 has 16 divisors (see below), whose sum is σ = 18489387972480. Its totient is φ = 5367886828560.

The previous prime is 11521075621309. The next prime is 11521075621439. The reversal of 11521075621394 is 49312657012511.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2485130474 + ... + 2485135109.

It is an arithmetic number, because the mean of its divisors is an integer number (1155586748280).

Almost surely, 2^{11521075621394} is an apocalyptic number.

11521075621394 is a deficient number, since it is larger than the sum of its proper divisors (6968312351086).

11521075621394 is a wasteful number, since it uses less digits than its factorization.

11521075621394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4970265665.

The product of its (nonzero) digits is 453600, while the sum is 47.

Adding to 11521075621394 its sum of digits (47), we get a square (11521075621441 = 3394271²).

The spelling of 11521075621394 in words is "eleven trillion, five hundred twenty-one billion, seventy-five million, six hundred twenty-one thousand, three hundred ninety-four".