1211211330 has 32 divisors (see below), whose sum is σ = 3322180224. Its totient is φ = 276848256.

The previous prime is 1211211329. The next prime is 1211211341. The reversal of 1211211330 is 331121121.

It is a happy number.

It is a super-4 number, since 4×1211211330⁴ (a number of 37 digits) contains 4444 as substring.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2883627 + ... + 2884046.

It is an arithmetic number, because the mean of its divisors is an integer number (103818132).

Almost surely, 2^1211211330 is an apocalyptic number.

1211211330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211211330 is an abundant number, since it is smaller than the sum of its proper divisors (2110968894).

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

1211211330 is a wasteful number, since it uses less digits than its factorization.

1211211330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5767690.

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

The square root of 1211211330 is about 34802.4615508731. The cubic root of 1211211330 is about 1065.9577093447.

Adding to 1211211330 its reverse (331121121), we get a palindrome (1542332451).

The spelling of 1211211330 in words is "one billion, two hundred eleven million, two hundred eleven thousand, three hundred thirty".