21020013103 has 8 divisors (see below), whose sum is σ = 22258145088. Its totient is φ = 19782065664.

The previous prime is 21020013071. The next prime is 21020013151. The reversal of 21020013103 is 30131002012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020013103 - 2⁵ = 21020013071 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 (21020013163) 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, 238650 + ... + 314632.

It is an arithmetic number, because the mean of its divisors is an integer number (2782268136).

Almost surely, 2^21020013103 is an apocalyptic number.

21020013103 is a deficient number, since it is larger than the sum of its proper divisors (1238131985).

21020013103 is a wasteful number, since it uses less digits than its factorization.

21020013103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92273.

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

Adding to 21020013103 its reverse (30131002012), we get a palindrome (51151015115).

The spelling of 21020013103 in words is "twenty-one billion, twenty million, thirteen thousand, one hundred three".