21402123103203 has 4 divisors (see below), whose sum is σ = 28536164137608. Its totient is φ = 14268082068800.

The previous prime is 21402123103181. The next prime is 21402123103247. The reversal of 21402123103203 is 30230132120412.

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 21402123103203 - 2⁶ = 21402123103139 is a prime.

It is a super-2 number, since 2×21402123103203² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21402123103103) 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, 3567020517198 + ... + 3567020517203.

It is an arithmetic number, because the mean of its divisors is an integer number (7134041034402).

Almost surely, 2^{21402123103203} is an apocalyptic number.

21402123103203 is a deficient number, since it is larger than the sum of its proper divisors (7134041034405).

21402123103203 is an equidigital number, since it uses as much as digits as its factorization.

21402123103203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7134041034404.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21402123103203 its reverse (30230132120412), we get a palindrome (51632255223615).

The spelling of 21402123103203 in words is "twenty-one trillion, four hundred two billion, one hundred twenty-three million, one hundred three thousand, two hundred three".