31220033122221 has 16 divisors (see below), whose sum is σ = 41857869406080. Its totient is φ = 20697782592960.

The previous prime is 31220033122177. The next prime is 31220033122231. The reversal of 31220033122221 is 12222133002213.

It is not a de Polignac number, because 31220033122221 - 2²¹ = 31220031025069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31220033122191 and 31220033122200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220033122231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18969216 + ... + 20549238.

It is an arithmetic number, because the mean of its divisors is an integer number (2616116837880).

Almost surely, 2^{31220033122221} is an apocalyptic number.

It is an amenable number.

31220033122221 is a deficient number, since it is larger than the sum of its proper divisors (10637836283859).

31220033122221 is a wasteful number, since it uses less digits than its factorization.

31220033122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616596.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 31220033122221 its reverse (12222133002213), we get a palindrome (43442166124434).

The spelling of 31220033122221 in words is "thirty-one trillion, two hundred twenty billion, thirty-three million, one hundred twenty-two thousand, two hundred twenty-one".