1211133210 has 256 divisors, whose sum is σ = 3701873664. Its totient is φ = 247283712.

The previous prime is 1211133199. The next prime is 1211133229. The reversal of 1211133210 is 123311121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1211133210.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7000684 + ... + 7000856.

It is an arithmetic number, because the mean of its divisors is an integer number (14460444).

Almost surely, 2^1211133210 is an apocalyptic number.

1211133210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211133210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1850936832).

1211133210 is an abundant number, since it is smaller than the sum of its proper divisors (2490740454).

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

1211133210 is a wasteful number, since it uses less digits than its factorization.

1211133210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1211133210 is about 34801.3391983699. The cubic root of 1211133210 is about 1065.9347916797.

Adding to 1211133210 its reverse (123311121), we get a palindrome (1334444331).

It can be divided in two parts, 1211 and 133210, that added together give a triangular number (134421 = T₅₁₈).

The spelling of 1211133210 in words is "one billion, two hundred eleven million, one hundred thirty-three thousand, two hundred ten".