21020000103 has 6 divisors (see below), whose sum is σ = 30362222384. Its totient is φ = 14013333396.

The previous prime is 21020000087. The next prime is 21020000119. The reversal of 21020000103 is 30100002012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21020000087) and next prime (21020000119).

It is not a de Polignac number, because 21020000103 - 2⁴ = 21020000087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2335555567 = 21020000103 / (2 + 1 + 0 + 2 + 0 + 0 + 0 + 0 + 1 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020000123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167777775 + ... + 1167777792.

Almost surely, 2^21020000103 is an apocalyptic number.

21020000103 is a deficient number, since it is larger than the sum of its proper divisors (9342222281).

21020000103 is a wasteful number, since it uses less digits than its factorization.

21020000103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335555573 (or 2335555570 counting only the distinct ones).

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

Adding to 21020000103 its reverse (30100002012), we get a palindrome (51120002115).

The spelling of 21020000103 in words is "twenty-one billion, twenty million, one hundred three", and thus it is an aban number.