21143021203 has 8 divisors (see below), whose sum is σ = 21373673472. Its totient is φ = 20912981256.

The previous prime is 21143021189. The next prime is 21143021231. The reversal of 21143021203 is 30212034112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21143021203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21143021243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83475 + ... + 221932.

It is an arithmetic number, because the mean of its divisors is an integer number (2671709184).

Almost surely, 2^21143021203 is an apocalyptic number.

21143021203 is a deficient number, since it is larger than the sum of its proper divisors (230652269).

21143021203 is a wasteful number, since it uses less digits than its factorization.

21143021203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306161.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21143021203 its reverse (30212034112), we get a palindrome (51355055315).

The spelling of 21143021203 in words is "twenty-one billion, one hundred forty-three million, twenty-one thousand, two hundred three".