211217923 has 16 divisors (see below), whose sum is σ = 244039680. Its totient is φ = 179071200.

The previous prime is 211217887. The next prime is 211217939. The reversal of 211217923 is 329712112.

211217923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211217923 - 2¹³ = 211209731 is a prime.

It is a super-2 number, since 2×211217923² = 89226021992867858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211217891 and 211217900.

It is not an unprimeable number, because it can be changed into a prime (211217983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319213 + ... + 319873.

It is an arithmetic number, because the mean of its divisors is an integer number (15252480).

Almost surely, 2^211217923 is an apocalyptic number.

211217923 is a deficient number, since it is larger than the sum of its proper divisors (32821757).

211217923 is a wasteful number, since it uses less digits than its factorization.

211217923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098.

The product of its digits is 1512, while the sum is 28.

The square root of 211217923 is about 14533.3383295098. The cubic root of 211217923 is about 595.5390665775.

The spelling of 211217923 in words is "two hundred eleven million, two hundred seventeen thousand, nine hundred twenty-three".