1211020321340 has 24 divisors (see below), whose sum is σ = 2543863464240. Its totient is φ = 484270835328.

The previous prime is 1211020321339. The next prime is 1211020321439. The reversal of 1211020321340 is 431230201121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8508482 + ... + 8649641.

It is an arithmetic number, because the mean of its divisors is an integer number (105994311010).

Almost surely, 2^{1211020321340} is an apocalyptic number.

1211020321340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211020321340 is an abundant number, since it is smaller than the sum of its proper divisors (1332843142900).

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

1211020321340 is a wasteful number, since it uses less digits than its factorization.

1211020321340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17161661 (or 17161659 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1211020321340 its reverse (431230201121), we get a palindrome (1642250522461).

The spelling of 1211020321340 in words is "one trillion, two hundred eleven billion, twenty million, three hundred twenty-one thousand, three hundred forty".