1211003433640 has 192 divisors, whose sum is σ = 3686132580480. Its totient is φ = 348420441600.

The previous prime is 1211003433631. The next prime is 1211003433643. The reversal of 1211003433640 is 463343001121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1211003433599 and 1211003433608.

It is not an unprimeable number, because it can be changed into a prime (1211003433643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 934326 + ... + 1815205.

It is an arithmetic number, because the mean of its divisors is an integer number (19198607190).

Almost surely, 2^{1211003433640} is an apocalyptic number.

1211003433640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211003433640 is an abundant number, since it is smaller than the sum of its proper divisors (2475129146840).

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

1211003433640 is a wasteful number, since it uses less digits than its factorization.

1211003433640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749584 (or 2749569 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 1211003433640 its reverse (463343001121), we get a palindrome (1674346434761).

The spelling of 1211003433640 in words is "one trillion, two hundred eleven billion, three million, four hundred thirty-three thousand, six hundred forty".