21124200403 has 4 divisors (see below), whose sum is σ = 21124514488. Its totient is φ = 21123886320.

The previous prime is 21124200401. The next prime is 21124200467. The reversal of 21124200403 is 30400242112.

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 21124200403 - 2¹ = 21124200401 is a prime.

It is a super-2 number, since 2×21124200403² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124200401) 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, 10701 + ... + 205822.

It is an arithmetic number, because the mean of its divisors is an integer number (5281128622).

Almost surely, 2^21124200403 is an apocalyptic number.

21124200403 is a deficient number, since it is larger than the sum of its proper divisors (314085).

21124200403 is an equidigital number, since it uses as much as digits as its factorization.

21124200403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314084.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21124200403 its reverse (30400242112), we get a palindrome (51524442515).

The spelling of 21124200403 in words is "twenty-one billion, one hundred twenty-four million, two hundred thousand, four hundred three".