1221444131340 has 96 divisors (see below), whose sum is σ = 3577642338816. Its totient is φ = 310779673600.

The previous prime is 1221444131333. The next prime is 1221444131377. The reversal of 1221444131340 is 431314441221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1221444131298 and 1221444131307.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550242 + ... + 1657001.

It is an arithmetic number, because the mean of its divisors is an integer number (37267107696).

Almost surely, 2^{1221444131340} is an apocalyptic number.

1221444131340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221444131340 is an abundant number, since it is smaller than the sum of its proper divisors (2356198207476).

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

1221444131340 is a wasteful number, since it uses less digits than its factorization.

1221444131340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207679 (or 2207677 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 1221444131340 its reverse (431314441221), we get a palindrome (1652758572561).

The spelling of 1221444131340 in words is "one trillion, two hundred twenty-one billion, four hundred forty-four million, one hundred thirty-one thousand, three hundred forty".