11400521401555 has 64 divisors (see below), whose sum is σ = 16140837081600. Its totient is φ = 7620931077120.

The previous prime is 11400521401519. The next prime is 11400521401583. The reversal of 11400521401555 is 55510412500411.

It is not a de Polignac number, because 11400521401555 - 2⁹ = 11400521401043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11400521401555.

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, 223650111 + ... + 223701079.

It is an arithmetic number, because the mean of its divisors is an integer number (252200579400).

Almost surely, 2^{11400521401555} is an apocalyptic number.

11400521401555 is a deficient number, since it is larger than the sum of its proper divisors (4740315680045).

11400521401555 is a wasteful number, since it uses less digits than its factorization.

11400521401555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52324.

The product of its (nonzero) digits is 20000, while the sum is 34.

Adding to 11400521401555 its reverse (55510412500411), we get a palindrome (66910933901966).

The spelling of 11400521401555 in words is "eleven trillion, four hundred billion, five hundred twenty-one million, four hundred one thousand, five hundred fifty-five".