21021200102 has 8 divisors (see below), whose sum is σ = 36036343056. Its totient is φ = 9009085752.

The previous prime is 21021200089. The next prime is 21021200141. The reversal of 21021200102 is 20100212012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 750757133 + ... + 750757160.

It is an arithmetic number, because the mean of its divisors is an integer number (4504542882).

Almost surely, 2^21021200102 is an apocalyptic number.

21021200102 is a deficient number, since it is larger than the sum of its proper divisors (15015142954).

21021200102 is a wasteful number, since it uses less digits than its factorization.

21021200102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501514302.

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

Adding to 21021200102 its reverse (20100212012), we get a palindrome (41121412114).

The spelling of 21021200102 in words is "twenty-one billion, twenty-one million, two hundred thousand, one hundred two".