21102102002 has 16 divisors (see below), whose sum is σ = 31873227840. Its totient is φ = 10477853232.

The previous prime is 21102101987. The next prime is 21102102041. The reversal of 21102102002 is 20020120112.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 226328 + ... + 305660.

It is an arithmetic number, because the mean of its divisors is an integer number (1992076740).

Almost surely, 2^21102102002 is an apocalyptic number.

21102102002 is a deficient number, since it is larger than the sum of its proper divisors (10771125838).

21102102002 is a wasteful number, since it uses less digits than its factorization.

21102102002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80257.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21102102002 its reverse (20020120112), we get a palindrome (41122222114).

The spelling of 21102102002 in words is "twenty-one billion, one hundred two million, one hundred two thousand, two".