1211323011000 has 128 divisors (see below), whose sum is σ = 3909649723200. Its totient is φ = 311880844800.

The previous prime is 1211323010959. The next prime is 1211323011007. The reversal of 1211323011000 is 1103231121.

It is a happy number.

It is a super-2 number, since 2×1211323011000² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211323011007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6874627 + ... + 7048626.

Almost surely, 2^{1211323011000} is an apocalyptic number.

1211323011000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211323011000 is an abundant number, since it is smaller than the sum of its proper divisors (2698326712200).

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

1211323011000 is a wasteful number, since it uses less digits than its factorization.

1211323011000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13923306 (or 13923292 counting only the distinct ones).

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

Adding to 1211323011000 its reverse (1103231121), we get a palindrome (1212426242121).

The spelling of 1211323011000 in words is "one trillion, two hundred eleven billion, three hundred twenty-three million, eleven thousand".