21142405203 has 16 divisors (see below), whose sum is σ = 28485716256. Its totient is φ = 13947422720.

The previous prime is 21142405177. The next prime is 21142405217. The reversal of 21142405203 is 30250424112.

It is a cyclic number.

It is not a de Polignac number, because 21142405203 - 2⁵ = 21142405171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21142405103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158623 + ... + 259703.

It is an arithmetic number, because the mean of its divisors is an integer number (1780357266).

Almost surely, 2^21142405203 is an apocalyptic number.

21142405203 is a deficient number, since it is larger than the sum of its proper divisors (7343311053).

21142405203 is a wasteful number, since it uses less digits than its factorization.

21142405203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101814.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21142405203 its reverse (30250424112), we get a palindrome (51392829315).

The spelling of 21142405203 in words is "twenty-one billion, one hundred forty-two million, four hundred five thousand, two hundred three".