211872145 has 8 divisors (see below), whose sum is σ = 254422656. Its totient is φ = 169380336.

The previous prime is 211872131. The next prime is 211872149. The reversal of 211872145 is 541278112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211872145 - 2²¹ = 209774993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211872149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6297 + ... + 21526.

It is an arithmetic number, because the mean of its divisors is an integer number (31802832).

Almost surely, 2^211872145 is an apocalyptic number.

It is an amenable number.

211872145 is a deficient number, since it is larger than the sum of its proper divisors (42550511).

211872145 is a wasteful number, since it uses less digits than its factorization.

211872145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29351.

The product of its digits is 4480, while the sum is 31.

The square root of 211872145 is about 14555.8285576603. The cubic root of 211872145 is about 596.1533029436.

It can be divided in two parts, 21187 and 2145, that added together give a palindrome (23332).

The spelling of 211872145 in words is "two hundred eleven million, eight hundred seventy-two thousand, one hundred forty-five".