2121221012 has 6 divisors (see below), whose sum is σ = 3712136778. Its totient is φ = 1060610504.

The previous prime is 2121220991. The next prime is 2121221017. The reversal of 2121221012 is 2101221212.

It can be written as a sum of positive squares in only one way, i.e., 1298449156 + 822771856 = 36034^2 + 28684^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265152623 + ... + 265152630.

It is an arithmetic number, because the mean of its divisors is an integer number (618689463).

Almost surely, 2^2121221012 is an apocalyptic number.

It is an amenable number.

2121221012 is a deficient number, since it is larger than the sum of its proper divisors (1590915766).

2121221012 is a wasteful number, since it uses less digits than its factorization.

2121221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530305257 (or 530305255 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2121221012 is about 46056.7151672804. The cubic root of 2121221012 is about 1284.8782378431.

Adding to 2121221012 its reverse (2101221212), we get a palindrome (4222442224).

It can be divided in two parts, 21212 and 21012, that added together give a palindrome (42224).

The spelling of 2121221012 in words is "two billion, one hundred twenty-one million, two hundred twenty-one thousand, twelve".