211431072 has 24 divisors (see below), whose sum is σ = 555006816. Its totient is φ = 70476992.

The previous prime is 211431071. The next prime is 211431089. The reversal of 211431072 is 270134112.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (211431071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101108 + ... + 1101299.

It is an arithmetic number, because the mean of its divisors is an integer number (23125284).

Almost surely, 2^211431072 is an apocalyptic number.

It is an amenable number.

211431072 is an abundant number, since it is smaller than the sum of its proper divisors (343575744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211431072 is a wasteful number, since it uses less digits than its factorization.

211431072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202420 (or 2202412 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 211431072 is about 14540.6695856828. The cubic root of 211431072 is about 595.7393271723.

Adding to 211431072 its reverse (270134112), we get a palindrome (481565184).

The spelling of 211431072 in words is "two hundred eleven million, four hundred thirty-one thousand, seventy-two".