31020132221 has 8 divisors (see below), whose sum is σ = 33712777560. Its totient is φ = 28371269952.

The previous prime is 31020132217. The next prime is 31020132277. The reversal of 31020132221 is 12223102013.

It can be written as a sum of positive squares in 4 ways, for example, as 8072124025 + 22948008196 = 89845^2 + 151486^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31020132221 - 2² = 31020132217 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 31020132221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020132281) 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, 10944290 + ... + 10947123.

It is an arithmetic number, because the mean of its divisors is an integer number (4214097195).

Almost surely, 2^31020132221 is an apocalyptic number.

It is an amenable number.

31020132221 is a deficient number, since it is larger than the sum of its proper divisors (2692645339).

31020132221 is a wasteful number, since it uses less digits than its factorization.

31020132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21891535.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31020132221 its reverse (12223102013), we get a palindrome (43243234234).

The spelling of 31020132221 in words is "thirty-one billion, twenty million, one hundred thirty-two thousand, two hundred twenty-one".