21000200102 has 16 divisors (see below), whose sum is σ = 36493500192. Its totient is φ = 8876796480.

The previous prime is 21000200087. The next prime is 21000200107. The reversal of 21000200102 is 20100200012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000200102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000200107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10273049 + ... + 10275092.

It is an arithmetic number, because the mean of its divisors is an integer number (2280843762).

Almost surely, 2^21000200102 is an apocalyptic number.

21000200102 is a deficient number, since it is larger than the sum of its proper divisors (15493300090).

21000200102 is a wasteful number, since it uses less digits than its factorization.

21000200102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20548223.

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

Adding to 21000200102 its reverse (20100200012), we get a palindrome (41100400114).

The spelling of 21000200102 in words is "twenty-one billion, two hundred thousand, one hundred two".