21021201202003 has 4 divisors (see below), whose sum is σ = 21021454409200. Its totient is φ = 21020947994808.

The previous prime is 21021201201983. The next prime is 21021201202033. The reversal of 21021201202003 is 30020210212012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021201202003 is a prime.

It is a super-2 number, since 2×21021201202003² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021201202033) 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, 126479028 + ... + 126645121.

It is an arithmetic number, because the mean of its divisors is an integer number (5255363602300).

Almost surely, 2^{21021201202003} is an apocalyptic number.

21021201202003 is a deficient number, since it is larger than the sum of its proper divisors (253207197).

21021201202003 is an equidigital number, since it uses as much as digits as its factorization.

21021201202003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253207196.

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

Adding to 21021201202003 its reverse (30020210212012), we get a palindrome (51041411414015).

The spelling of 21021201202003 in words is "twenty-one trillion, twenty-one billion, two hundred one million, two hundred two thousand, three".