21202102002 has 64 divisors (see below), whose sum is σ = 43781990400. Its totient is φ = 6842596800.

The previous prime is 21202102001. The next prime is 21202102003. The reversal of 21202102002 is 20020120212.

It is an interprime number because it is at equal distance from previous prime (21202102001) and next prime (21202102003).

It is not an unprimeable number, because it can be changed into a prime (21202102001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5120449 + ... + 5124587.

It is an arithmetic number, because the mean of its divisors is an integer number (684093600).

Almost surely, 2^21202102002 is an apocalyptic number.

21202102002 is an abundant number, since it is smaller than the sum of its proper divisors (22579888398).

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

21202102002 is a wasteful number, since it uses less digits than its factorization.

21202102002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21202102002 its reverse (20020120212), we get a palindrome (41222222214).

It can be divided in two parts, 2120210 and 2002, that added together give a palindrome (2122212).

The spelling of 21202102002 in words is "twenty-one billion, two hundred two million, one hundred two thousand, two".