1321220331042 has 16 divisors (see below), whose sum is σ = 2662611966432. Its totient is φ = 437044892960.

The previous prime is 1321220330999. The next prime is 1321220331107. The reversal of 1321220331042 is 2401330221231.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840470163 + ... + 840471734.

It is an arithmetic number, because the mean of its divisors is an integer number (166413247902).

Almost surely, 2^{1321220331042} is an apocalyptic number.

1321220331042 is an abundant number, since it is smaller than the sum of its proper divisors (1341391635390).

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

1321220331042 is a wasteful number, since it uses less digits than its factorization.

1321220331042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680942033.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 1321220331042 its reverse (2401330221231), we get a palindrome (3722550552273).

The spelling of 1321220331042 in words is "one trillion, three hundred twenty-one billion, two hundred twenty million, three hundred thirty-one thousand, forty-two".