21101021331203 has 6 divisors (see below), whose sum is σ = 23193684603852. Its totient is φ = 19182746664620.

The previous prime is 21101021331199. The next prime is 21101021331209. The reversal of 21101021331203 is 30213312010112.

It is a happy number.

It is not a de Polignac number, because 21101021331203 - 2² = 21101021331199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101021331209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87194302901 + ... + 87194303142.

It is an arithmetic number, because the mean of its divisors is an integer number (3865614100642).

Almost surely, 2^{21101021331203} is an apocalyptic number.

21101021331203 is a deficient number, since it is larger than the sum of its proper divisors (2092663272649).

21101021331203 is a wasteful number, since it uses less digits than its factorization.

21101021331203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174388606065 (or 174388606054 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21101021331203 its reverse (30213312010112), we get a palindrome (51314333341315).

The spelling of 21101021331203 in words is "twenty-one trillion, one hundred one billion, twenty-one million, three hundred thirty-one thousand, two hundred three".