211212205625 has 40 divisors (see below), whose sum is σ = 289901451840. Its totient is φ = 153116568000.

The previous prime is 211212205621. The next prime is 211212205691. The reversal of 211212205625 is 526502212112.

It is a happy number.

It is not a de Polignac number, because 211212205625 - 2² = 211212205621 is a prime.

It is a super-2 number, since 2×211212205625² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211212205621) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 113534 + ... + 659783.

It is an arithmetic number, because the mean of its divisors is an integer number (7247536296).

Almost surely, 2^211212205625 is an apocalyptic number.

211212205625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211212205625 is a deficient number, since it is larger than the sum of its proper divisors (78689246215).

211212205625 is an equidigital number, since it uses as much as digits as its factorization.

211212205625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773379 (or 773364 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 211212205625 its reverse (526502212112), we get a palindrome (737714417737).

The spelling of 211212205625 in words is "two hundred eleven billion, two hundred twelve million, two hundred five thousand, six hundred twenty-five".