215400455111 has 4 divisors (see below), whose sum is σ = 215406295512. Its totient is φ = 215394614712.

The previous prime is 215400455099. The next prime is 215400455147. The reversal of 215400455111 is 111554004512.

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

It is a cyclic number.

It is not a de Polignac number, because 215400455111 - 2⁶ = 215400455047 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 (215400755111) 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, 2864525 + ... + 2938758.

It is an arithmetic number, because the mean of its divisors is an integer number (53851573878).

Almost surely, 2^215400455111 is an apocalyptic number.

215400455111 is a deficient number, since it is larger than the sum of its proper divisors (5840401).

215400455111 is an equidigital number, since it uses as much as digits as its factorization.

215400455111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840400.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 215400455111 its reverse (111554004512), we get a palindrome (326954459623).

The spelling of 215400455111 in words is "two hundred fifteen billion, four hundred million, four hundred fifty-five thousand, one hundred eleven".