21031001002 has 32 divisors (see below), whose sum is σ = 36460139904. Its totient is φ = 8991936000.

The previous prime is 21031000973. The next prime is 21031001039. The reversal of 21031001002 is 20010013012.

It is a super-2 number, since 2×21031001002² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21031001002.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 657963 + ... + 689185.

It is an arithmetic number, because the mean of its divisors is an integer number (1139379372).

Almost surely, 2^21031001002 is an apocalyptic number.

21031001002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21031001002 is a deficient number, since it is larger than the sum of its proper divisors (15429138902).

21031001002 is a wasteful number, since it uses less digits than its factorization.

21031001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33054.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21031001002 its reverse (20010013012), we get a palindrome (41041014014).

The spelling of 21031001002 in words is "twenty-one billion, thirty-one million, one thousand, two".