21029103 has 12 divisors (see below), whose sum is σ = 30418440. Its totient is φ = 13999536.

The previous prime is 21029101. The next prime is 21029111. The reversal of 21029103 is 30192012.

It is a happy number.

It is not a de Polignac number, because 21029103 - 2¹ = 21029101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21029101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8025 + ... + 10317.

It is an arithmetic number, because the mean of its divisors is an integer number (2534870).

Almost surely, 2^21029103 is an apocalyptic number.

21029103 is a deficient number, since it is larger than the sum of its proper divisors (9389337).

21029103 is a wasteful number, since it uses less digits than its factorization.

21029103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318 (or 3315 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21029103 is about 4585.7499931854. The cubic root of 21029103 is about 276.0198079672.

The spelling of 21029103 in words is "twenty-one million, twenty-nine thousand, one hundred three".