216211511057 has 4 divisors (see below), whose sum is σ = 216217804800. Its totient is φ = 216205217316.

The previous prime is 216211511053. The next prime is 216211511071. The reversal of 216211511057 is 750115112612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216211511057 - 2² = 216211511053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216211511051) 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, 3095057 + ... + 3164142.

It is an arithmetic number, because the mean of its divisors is an integer number (54054451200).

Almost surely, 2^216211511057 is an apocalyptic number.

It is an amenable number.

216211511057 is a deficient number, since it is larger than the sum of its proper divisors (6293743).

216211511057 is an equidigital number, since it uses as much as digits as its factorization.

216211511057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6293742.

The product of its (nonzero) digits is 4200, while the sum is 32.

Adding to 216211511057 its reverse (750115112612), we get a palindrome (966326623669).

The spelling of 216211511057 in words is "two hundred sixteen billion, two hundred eleven million, five hundred eleven thousand, fifty-seven".