211742245 has 64 divisors (see below), whose sum is σ = 317011968. Its totient is φ = 133632000.

The previous prime is 211742239. The next prime is 211742249. The reversal of 211742245 is 542247112.

It is not a de Polignac number, because 211742245 - 2¹³ = 211734053 is a prime.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211742249) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 908649 + ... + 908881.

It is an arithmetic number, because the mean of its divisors is an integer number (4953312).

Almost surely, 2^211742245 is an apocalyptic number.

It is an amenable number.

211742245 is a deficient number, since it is larger than the sum of its proper divisors (105269723).

211742245 is a wasteful number, since it uses less digits than its factorization.

211742245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334.

The product of its digits is 4480, while the sum is 28.

The square root of 211742245 is about 14551.3657434620. The cubic root of 211742245 is about 596.0314430583.

Adding to 211742245 its reverse (542247112), we get a palindrome (753989357).

The spelling of 211742245 in words is "two hundred eleven million, seven hundred forty-two thousand, two hundred forty-five".