2157240011 has 4 divisors (see below), whose sum is σ = 2173707624. Its totient is φ = 2140772400.

The previous prime is 2157239999. The next prime is 2157240013. The reversal of 2157240011 is 1100427512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2157240011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157240013) 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, 8233610 + ... + 8233871.

It is an arithmetic number, because the mean of its divisors is an integer number (543426906).

Almost surely, 2^2157240011 is an apocalyptic number.

2157240011 is a deficient number, since it is larger than the sum of its proper divisors (16467613).

2157240011 is a wasteful number, since it uses less digits than its factorization.

2157240011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16467612.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 2157240011 is about 46446.0979092970. The cubic root of 2157240011 is about 1292.1100037893.

Adding to 2157240011 its reverse (1100427512), we get a palindrome (3257667523).

The spelling of 2157240011 in words is "two billion, one hundred fifty-seven million, two hundred forty thousand, eleven".