21062103 has 4 divisors (see below), whose sum is σ = 28082808. Its totient is φ = 14041400.

The previous prime is 21062101. The next prime is 21062137. The reversal of 21062103 is 30126012.

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

It is a cyclic number.

It is not a de Polignac number, because 21062103 - 2¹ = 21062101 is a prime.

It is a super-2 number, since 2×21062103² = 887224365565218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062101) 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, 3510348 + ... + 3510353.

It is an arithmetic number, because the mean of its divisors is an integer number (7020702).

Almost surely, 2^21062103 is an apocalyptic number.

21062103 is a deficient number, since it is larger than the sum of its proper divisors (7020705).

21062103 is an equidigital number, since it uses as much as digits as its factorization.

21062103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7020704.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21062103 is about 4589.3466855316. The cubic root of 21062103 is about 276.1641142208.

Adding to 21062103 its reverse (30126012), we get a palindrome (51188115).

The spelling of 21062103 in words is "twenty-one million, sixty-two thousand, one hundred three".