21013002103 has 4 divisors (see below), whose sum is σ = 21164174920. Its totient is φ = 20861829288.

The previous prime is 21013002089. The next prime is 21013002119. The reversal of 21013002103 is 30120031012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21013002103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013002203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75586200 + ... + 75586477.

It is an arithmetic number, because the mean of its divisors is an integer number (5291043730).

Almost surely, 2^21013002103 is an apocalyptic number.

21013002103 is a deficient number, since it is larger than the sum of its proper divisors (151172817).

21013002103 is a wasteful number, since it uses less digits than its factorization.

21013002103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151172816.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21013002103 its reverse (30120031012), we get a palindrome (51133033115).

The spelling of 21013002103 in words is "twenty-one billion, thirteen million, two thousand, one hundred three".