1020121002 has 24 divisors (see below), whose sum is σ = 2224346436. Its totient is φ = 337873536.

The previous prime is 1020120979. The next prime is 1020121007. The reversal of 1020121002 is 2001210201.

It can be written as a sum of positive squares in 2 ways, for example, as 948701601 + 71419401 = 30801^2 + 8451^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1020121007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177663 + ... + 183314.

Almost surely, 2^1020121002 is an apocalyptic number.

1020121002 is an abundant number, since it is smaller than the sum of its proper divisors (1204225434).

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

1020121002 is a wasteful number, since it uses less digits than its factorization.

1020121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361142 (or 361139 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1020121002 is about 31939.3331489560. Note that the first 3 decimals coincide. The cubic root of 1020121002 is about 1006.6625130062.

Adding to 1020121002 its reverse (2001210201), we get a palindrome (3021331203).

The spelling of 1020121002 in words is "one billion, twenty million, one hundred twenty-one thousand, two".