21203022003 has 8 divisors (see below), whose sum is σ = 28272302016. Its totient is φ = 14134545000.

The previous prime is 21203021993. The next prime is 21203022037. The reversal of 21203022003 is 30022030212.

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

It is not a de Polignac number, because 21203022003 - 2¹⁴ = 21203005619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21203022403) 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, 136173 + ... + 246878.

It is an arithmetic number, because the mean of its divisors is an integer number (3534037752).

Almost surely, 2^21203022003 is an apocalyptic number.

21203022003 is a deficient number, since it is larger than the sum of its proper divisors (7069280013).

21203022003 is a wasteful number, since it uses less digits than its factorization.

21203022003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401505.

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21203022003 its reverse (30022030212), we get a palindrome (51225052215).

The spelling of 21203022003 in words is "twenty-one billion, two hundred three million, twenty-two thousand, three".