21001421203 has 16 divisors (see below), whose sum is σ = 24636801024. Its totient is φ = 17528726880.

The previous prime is 21001421191. The next prime is 21001421213. The reversal of 21001421203 is 30212410012.

It is not a de Polignac number, because 21001421203 - 2¹³ = 21001413011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001421213) 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, 97203 + ... + 226828.

It is an arithmetic number, because the mean of its divisors is an integer number (1539800064).

Almost surely, 2^21001421203 is an apocalyptic number.

21001421203 is a deficient number, since it is larger than the sum of its proper divisors (3635379821).

21001421203 is a wasteful number, since it uses less digits than its factorization.

21001421203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324282.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21001421203 its reverse (30212410012), we get a palindrome (51213831215).

The spelling of 21001421203 in words is "twenty-one billion, one million, four hundred twenty-one thousand, two hundred three".