211994636 has 24 divisors (see below), whose sum is σ = 424359936. Its totient is φ = 90775440.

The previous prime is 211994617. The next prime is 211994659. The reversal of 211994636 is 636499112.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 211994593 and 211994602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38615 + ... + 43761.

It is an arithmetic number, because the mean of its divisors is an integer number (17681664).

Almost surely, 2^211994636 is an apocalyptic number.

It is an amenable number.

211994636 is an abundant number, since it is smaller than the sum of its proper divisors (212365300).

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

211994636 is a wasteful number, since it uses less digits than its factorization.

211994636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6629 (or 6627 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 211994636 is about 14560.0355768796. The cubic root of 211994636 is about 596.2681667863.

The spelling of 211994636 in words is "two hundred eleven million, nine hundred ninety-four thousand, six hundred thirty-six".