21003012102 has 8 divisors (see below), whose sum is σ = 42006024216. Its totient is φ = 7001004032.

The previous prime is 21003012101. The next prime is 21003012103. The reversal of 21003012102 is 20121030012.

It is an interprime number because it is at equal distance from previous prime (21003012101) and next prime (21003012103).

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

21003012102 is an admirable number.

It is a super-2 number, since 2×21003012102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003012101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750251003 + ... + 1750251014.

It is an arithmetic number, because the mean of its divisors is an integer number (5250753027).

Almost surely, 2^21003012102 is an apocalyptic number.

21003012102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21003012102 is a wasteful number, since it uses less digits than its factorization.

21003012102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500502022.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21003012102 its reverse (20121030012), we get a palindrome (41124042114).

The spelling of 21003012102 in words is "twenty-one billion, three million, twelve thousand, one hundred two".