1331121220442 has 16 divisors (see below), whose sum is σ = 2151447188352. Its totient is φ = 614028083760.

The previous prime is 1331121220361. The next prime is 1331121220447. The reversal of 1331121220442 is 2440221211331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (1331121220447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13932998 + ... + 14028209.

It is an arithmetic number, because the mean of its divisors is an integer number (134465449272).

Almost surely, 2^{1331121220442} is an apocalyptic number.

1331121220442 is a deficient number, since it is larger than the sum of its proper divisors (820325967910).

1331121220442 is a wasteful number, since it uses less digits than its factorization.

1331121220442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27963053.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 1331121220442 its reverse (2440221211331), we get a palindrome (3771342431773).

The spelling of 1331121220442 in words is "one trillion, three hundred thirty-one billion, one hundred twenty-one million, two hundred twenty thousand, four hundred forty-two".