21003000102 has 96 divisors (see below), whose sum is σ = 55404760320. Its totient is φ = 5616475200.

The previous prime is 21003000079. The next prime is 21003000131. The reversal of 21003000102 is 20100030012.

It is a happy number.

It is a super-2 number, since 2×21003000102² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 145852 + ... + 251552.

It is an arithmetic number, because the mean of its divisors is an integer number (577132920).

Almost surely, 2^21003000102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21003000102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27702380160).

21003000102 is an abundant number, since it is smaller than the sum of its proper divisors (34401760218).

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

21003000102 is a wasteful number, since it uses less digits than its factorization.

21003000102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105818 (or 105815 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21003000102 its reverse (20100030012), we get a palindrome (41103030114).

The spelling of 21003000102 in words is "twenty-one billion, three million, one hundred two", and thus it is an aban number.