31220420311 has 4 divisors (see below), whose sum is σ = 31235086800. Its totient is φ = 31205753824.

The previous prime is 31220420299. The next prime is 31220420333. The reversal of 31220420311 is 11302402213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31220420311 - 2⁵ = 31220420279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220420111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7330051 + ... + 7334308.

It is an arithmetic number, because the mean of its divisors is an integer number (7808771700).

Almost surely, 2^31220420311 is an apocalyptic number.

31220420311 is a deficient number, since it is larger than the sum of its proper divisors (14666489).

31220420311 is a wasteful number, since it uses less digits than its factorization.

31220420311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14666488.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31220420311 its reverse (11302402213), we get a palindrome (42522822524).

The spelling of 31220420311 in words is "thirty-one billion, two hundred twenty million, four hundred twenty thousand, three hundred eleven".