31220430143221 has 8 divisors (see below), whose sum is σ = 35539461981504. Its totient is φ = 27148200124320.

The previous prime is 31220430143197. The next prime is 31220430143233. The reversal of 31220430143221 is 12234103402213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31220430143221 - 2⁹ = 31220430142709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31220430143221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220430141221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61700454576 + ... + 61700455081.

It is an arithmetic number, because the mean of its divisors is an integer number (4442432747688).

Almost surely, 2^{31220430143221} is an apocalyptic number.

It is an amenable number.

31220430143221 is a deficient number, since it is larger than the sum of its proper divisors (4319031838283).

31220430143221 is a wasteful number, since it uses less digits than its factorization.

31220430143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123400909691.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 31220430143221 its reverse (12234103402213), we get a palindrome (43454533545434).

The spelling of 31220430143221 in words is "thirty-one trillion, two hundred twenty billion, four hundred thirty million, one hundred forty-three thousand, two hundred twenty-one".