31220221302204 has 192 divisors, whose sum is σ = 84513368701440. Its totient is φ = 8865166049280.

The previous prime is 31220221302181. The next prime is 31220221302223. The reversal of 31220221302204 is 40220312202213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 770297812 + ... + 770338340.

It is an arithmetic number, because the mean of its divisors is an integer number (440173795320).

Almost surely, 2^{31220221302204} is an apocalyptic number.

31220221302204 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31220221302204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42256684350720).

31220221302204 is an abundant number, since it is smaller than the sum of its proper divisors (53293147399236).

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

31220221302204 is a wasteful number, since it uses less digits than its factorization.

31220221302204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42060 (or 42058 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31220221302204 its reverse (40220312202213), we get a palindrome (71440533504417).

Subtracting 31220221302204 from its reverse (40220312202213), we obtain a palindrome (9000090900009).

The spelling of 31220221302204 in words is "thirty-one trillion, two hundred twenty billion, two hundred twenty-one million, three hundred two thousand, two hundred four".