3121221012 has 144 divisors (see below), whose sum is σ = 9660651840. Its totient is φ = 774724608.

The previous prime is 3121220941. The next prime is 3121221083. The reversal of 3121221012 is 2101221213.

It is an interprime number because it is at equal distance from previous prime (3121220941) and next prime (3121221083).

It is a junction number, because it is equal to n+sod(n) for n = 3121220982 and 3121221000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 117939 + ... + 141957.

It is an arithmetic number, because the mean of its divisors is an integer number (67087860).

Almost surely, 2^3121221012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121221012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4830325920).

3121221012 is an abundant number, since it is smaller than the sum of its proper divisors (6539430828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121221012 is a wasteful number, since it uses less digits than its factorization.

3121221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24070 (or 24061 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 3121221012 is about 55867.8889166219. Note that the first 3 decimals coincide. The cubic root of 3121221012 is about 1461.4193072378.

Adding to 3121221012 its reverse (2101221213), we get a palindrome (5222442225).

The spelling of 3121221012 in words is "three billion, one hundred twenty-one million, two hundred twenty-one thousand, twelve".