1211043042440 has 64 divisors (see below), whose sum is σ = 3397211660160. Its totient is φ = 377467960320.

The previous prime is 1211043042439. The next prime is 1211043042551. The reversal of 1211043042440 is 442403401121.

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, 196594817 + ... + 196600976.

It is an arithmetic number, because the mean of its divisors is an integer number (53081432190).

Almost surely, 2^{1211043042440} is an apocalyptic number.

1211043042440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211043042440 is an abundant number, since it is smaller than the sum of its proper divisors (2186168617720).

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

1211043042440 is a wasteful number, since it uses less digits than its factorization.

1211043042440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393195822 (or 393195818 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 1211043042440 its reverse (442403401121), we get a palindrome (1653446443561).

The spelling of 1211043042440 in words is "one trillion, two hundred eleven billion, forty-three million, forty-two thousand, four hundred forty".