31220123011 has 64 divisors (see below), whose sum is σ = 41715302400. Its totient is φ = 22632825600.

The previous prime is 31220123003. The next prime is 31220123021. The reversal of 31220123011 is 11032102213.

It is not a de Polignac number, because 31220123011 - 2³ = 31220123003 is a prime.

It is a super-2 number, since 2×31220123011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220123021) 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 63 ways as a sum of consecutive naturals, for example, 21223006 + ... + 21224476.

It is an arithmetic number, because the mean of its divisors is an integer number (651801600).

Almost surely, 2^31220123011 is an apocalyptic number.

31220123011 is a deficient number, since it is larger than the sum of its proper divisors (10495179389).

31220123011 is a wasteful number, since it uses less digits than its factorization.

31220123011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31220123011 its reverse (11032102213), we get a palindrome (42252225224).

The spelling of 31220123011 in words is "thirty-one billion, two hundred twenty million, one hundred twenty-three thousand, eleven".