211235172745 has 4 divisors (see below), whose sum is σ = 253482207300. Its totient is φ = 168988138192.

The previous prime is 211235172697. The next prime is 211235172763. The reversal of 211235172745 is 547271532112.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 139526902089 + 71708270656 = 373533^2 + 267784^2 .

It is a cyclic number.

It is not a de Polignac number, because 211235172745 - 2¹⁵ = 211235139977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211235172698 and 211235172707.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21123517270 + ... + 21123517279.

It is an arithmetic number, because the mean of its divisors is an integer number (63370551825).

Almost surely, 2^211235172745 is an apocalyptic number.

It is an amenable number.

211235172745 is a deficient number, since it is larger than the sum of its proper divisors (42247034555).

211235172745 is an equidigital number, since it uses as much as digits as its factorization.

211235172745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42247034554.

The product of its digits is 117600, while the sum is 40.

The spelling of 211235172745 in words is "two hundred eleven billion, two hundred thirty-five million, one hundred seventy-two thousand, seven hundred forty-five".