1021021002 has 24 divisors (see below), whose sum is σ = 2212816320. Its totient is φ = 340247400.

The previous prime is 1021020961. The next prime is 1021021007. The reversal of 1021021002 is 2001201201.

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 (1021021007) 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 11 ways as a sum of consecutive naturals, for example, 102127 + ... + 111677.

It is an arithmetic number, because the mean of its divisors is an integer number (92200680).

Almost surely, 2^1021021002 is an apocalyptic number.

1021021002 is an abundant number, since it is smaller than the sum of its proper divisors (1191795318).

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

1021021002 is a wasteful number, since it uses less digits than its factorization.

1021021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15498 (or 15495 counting only the distinct ones).

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

The square root of 1021021002 is about 31953.4192536573. The cubic root of 1021021002 is about 1006.9584680783.

Adding to 1021021002 its reverse (2001201201), we get a palindrome (3022222203).

The spelling of 1021021002 in words is "one billion, twenty-one million, twenty-one thousand, two".