211212205850 has 24 divisors (see below), whose sum is σ = 393023310300. Its totient is φ = 84448622720.

The previous prime is 211212205849. The next prime is 211212205879. The reversal of 211212205850 is 58502212112.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 90970401769 + 120241804081 = 301613^2 + 346759^2 .

It is a super-2 number, since 2×211212205850² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 788675 + ... + 1021974.

Almost surely, 2^211212205850 is an apocalyptic number.

211212205850 is a deficient number, since it is larger than the sum of its proper divisors (181811104450).

211212205850 is a wasteful number, since it uses less digits than its factorization.

211212205850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812994 (or 1812989 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 29.

Adding to 211212205850 its reverse (58502212112), we get a palindrome (269714417962).

The spelling of 211212205850 in words is "two hundred eleven billion, two hundred twelve million, two hundred five thousand, eight hundred fifty".