1211133021210 has 48 divisors (see below), whose sum is σ = 3598795264896. Its totient is φ = 276830404704.

The previous prime is 1211133021179. The next prime is 1211133021271. The reversal of 1211133021210 is 121203311121.

1211133021210 is a `hidden beast` number, since 1 + 2 + 111 + 330 + 212 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 961216054 + ... + 961217313.

It is an arithmetic number, because the mean of its divisors is an integer number (74974901352).

Almost surely, 2^{1211133021210} is an apocalyptic number.

1211133021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211133021210 is an abundant number, since it is smaller than the sum of its proper divisors (2387662243686).

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

1211133021210 is a wasteful number, since it uses less digits than its factorization.

1211133021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922433387 (or 1922433384 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1211133021210 its reverse (121203311121), we get a palindrome (1332336332331).

The spelling of 1211133021210 in words is "one trillion, two hundred eleven billion, one hundred thirty-three million, twenty-one thousand, two hundred ten".