211897144 has 8 divisors (see below), whose sum is σ = 397307160. Its totient is φ = 105948568.

The previous prime is 211897117. The next prime is 211897151. The reversal of 211897144 is 441798112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13243564 + ... + 13243579.

It is an arithmetic number, because the mean of its divisors is an integer number (49663395).

Almost surely, 2^211897144 is an apocalyptic number.

It is an amenable number.

211897144 is a deficient number, since it is larger than the sum of its proper divisors (185410016).

211897144 is a wasteful number, since it uses less digits than its factorization.

211897144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26487149 (or 26487145 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 211897144 is about 14556.6872604999. The cubic root of 211897144 is about 596.1767489237.

The spelling of 211897144 in words is "two hundred eleven million, eight hundred ninety-seven thousand, one hundred forty-four".