981221012 has 12 divisors (see below), whose sum is σ = 1749535956. Its totient is φ = 481353600.

The previous prime is 981220993. The next prime is 981221023. The reversal of 981221012 is 210122189.

It can be written as a sum of positive squares in 2 ways, for example, as 897242116 + 83978896 = 29954^2 + 9164^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2313989 + ... + 2314412.

It is an arithmetic number, because the mean of its divisors is an integer number (145794663).

Almost surely, 2^981221012 is an apocalyptic number.

It is an amenable number.

981221012 is a deficient number, since it is larger than the sum of its proper divisors (768314944).

981221012 is a wasteful number, since it uses less digits than its factorization.

981221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628458 (or 4628456 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 981221012 is about 31324.4475130847. The cubic root of 981221012 is about 993.7007399761.

The spelling of 981221012 in words is "nine hundred eighty-one million, two hundred twenty-one thousand, twelve".