211955862807 has 128 divisors (see below), whose sum is σ = 355722035200. Its totient is φ = 126138111840.

The previous prime is 211955862803. The next prime is 211955862857. The reversal of 211955862807 is 708268559112.

211955862807 is a `hidden beast` number, since 2 + 1 + 1 + 9 + 5 + 5 + 8 + 628 + 0 + 7 = 666.

It is not a de Polignac number, because 211955862807 - 2² = 211955862803 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 (211955862803) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 148949298 + ... + 148950720.

It is an arithmetic number, because the mean of its divisors is an integer number (2779078400).

Almost surely, 2^211955862807 is an apocalyptic number.

211955862807 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

211955862807 is a deficient number, since it is larger than the sum of its proper divisors (143766172393).

211955862807 is an frugal number, since it uses more digits than its factorization.

211955862807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514 (or 1470 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 54.

The spelling of 211955862807 in words is "two hundred eleven billion, nine hundred fifty-five million, eight hundred sixty-two thousand, eight hundred seven".