1211500212 has 96 divisors (see below), whose sum is σ = 3155066880. Its totient is φ = 359303040.

The previous prime is 1211500207. The next prime is 1211500217. The reversal of 1211500212 is 2120051121.

It is an interprime number because it is at equal distance from previous prime (1211500207) and next prime (1211500217).

It is a junction number, because it is equal to n+sod(n) for n = 1211500191 and 1211500200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211500217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2316183 + ... + 2316705.

It is an arithmetic number, because the mean of its divisors is an integer number (32865280).

Almost surely, 2^1211500212 is an apocalyptic number.

1211500212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211500212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577533440).

1211500212 is an abundant number, since it is smaller than the sum of its proper divisors (1943566668).

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

1211500212 is a wasteful number, since it uses less digits than its factorization.

1211500212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053 (or 1051 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1211500212 is about 34806.6116133128. The cubic root of 1211500212 is about 1066.0424486216.

Adding to 1211500212 its reverse (2120051121), we get a palindrome (3331551333).

The spelling of 1211500212 in words is "one billion, two hundred eleven million, five hundred thousand, two hundred twelve".