31221511442 has 16 divisors (see below), whose sum is σ = 51093892800. Its totient is φ = 14190444240.

The previous prime is 31221511429. The next prime is 31221511463. The reversal of 31221511442 is 24411512213.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258059 + ... + 359217.

It is an arithmetic number, because the mean of its divisors is an integer number (3193368300).

Almost surely, 2^31221511442 is an apocalyptic number.

31221511442 is a deficient number, since it is larger than the sum of its proper divisors (19872381358).

31221511442 is a wasteful number, since it uses less digits than its factorization.

31221511442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115201.

The product of its digits is 1920, while the sum is 26.

The spelling of 31221511442 in words is "thirty-one billion, two hundred twenty-one million, five hundred eleven thousand, four hundred forty-two".