31220121110011 has 4 divisors (see below), whose sum is σ = 31221341768232. Its totient is φ = 31218900451792.

The previous prime is 31220121109949. The next prime is 31220121110029. The reversal of 31220121110011 is 11001112102213.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220121110011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220121110041) 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, 610290745 + ... + 610341898.

It is an arithmetic number, because the mean of its divisors is an integer number (7805335442058).

Almost surely, 2^{31220121110011} is an apocalyptic number.

31220121110011 is a deficient number, since it is larger than the sum of its proper divisors (1220658221).

31220121110011 is a wasteful number, since it uses less digits than its factorization.

31220121110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220658220.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 31220121110011 its reverse (11001112102213), we get a palindrome (42221233212224).

The spelling of 31220121110011 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred ten thousand, eleven".