31221201404442 has 64 divisors (see below), whose sum is σ = 71401398082560. Its totient is φ = 8915512682496.

The previous prime is 31221201404413. The next prime is 31221201404447. The reversal of 31221201404442 is 24440410212213.

It is a super-2 number, since 2×31221201404442² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31221201404447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1460493658 + ... + 1460515034.

It is an arithmetic number, because the mean of its divisors is an integer number (1115646845040).

Almost surely, 2^{31221201404442} is an apocalyptic number.

31221201404442 is an abundant number, since it is smaller than the sum of its proper divisors (40180196678118).

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

31221201404442 is a wasteful number, since it uses less digits than its factorization.

31221201404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38595.

The product of its (nonzero) digits is 12288, while the sum is 30.

Adding to 31221201404442 its reverse (24440410212213), we get a palindrome (55661611616655).

The spelling of 31221201404442 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred one million, four hundred four thousand, four hundred forty-two".