31220420241 has 16 divisors (see below), whose sum is σ = 41766298560. Its totient is φ = 20744156160.

The previous prime is 31220420237. The next prime is 31220420243. The reversal of 31220420241 is 14202402213.

It is not a de Polignac number, because 31220420241 - 2² = 31220420237 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31220420243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756921 + ... + 1774601.

It is an arithmetic number, because the mean of its divisors is an integer number (2610393660).

Almost surely, 2^31220420241 is an apocalyptic number.

It is an amenable number.

31220420241 is a deficient number, since it is larger than the sum of its proper divisors (10545878319).

31220420241 is a wasteful number, since it uses less digits than its factorization.

31220420241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19616.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 31220420241 its reverse (14202402213), we get a palindrome (45422822454).

The spelling of 31220420241 in words is "thirty-one billion, two hundred twenty million, four hundred twenty thousand, two hundred forty-one".