31221221301102 has 32 divisors (see below), whose sum is σ = 71436285759744. Its totient is φ = 8911162166400.

The previous prime is 31221221301071. The next prime is 31221221301103. The reversal of 31221221301102 is 20110312212213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221221301103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382741099 + ... + 382822662.

It is an arithmetic number, because the mean of its divisors is an integer number (2232383929992).

Almost surely, 2^{31221221301102} is an apocalyptic number.

31221221301102 is an abundant number, since it is smaller than the sum of its proper divisors (40215064458642).

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

31221221301102 is a wasteful number, since it uses less digits than its factorization.

31221221301102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765564744.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31221221301102 its reverse (20110312212213), we get a palindrome (51331533513315).

The spelling of 31221221301102 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, three hundred one thousand, one hundred two".