21203110331 has 16 divisors (see below), whose sum is σ = 23609429760. Its totient is φ = 18909624960.

The previous prime is 21203110321. The next prime is 21203110333. The reversal of 21203110331 is 13301130212.

It is a cyclic number.

It is not a de Polignac number, because 21203110331 - 2¹⁰ = 21203109307 is a prime.

It is a super-2 number, since 2×21203110331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203110333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204125 + ... + 289953.

It is an arithmetic number, because the mean of its divisors is an integer number (1475589360).

Almost surely, 2^21203110331 is an apocalyptic number.

21203110331 is a deficient number, since it is larger than the sum of its proper divisors (2406319429).

21203110331 is a wasteful number, since it uses less digits than its factorization.

21203110331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86486.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21203110331 its reverse (13301130212), we get a palindrome (34504240543).

The spelling of 21203110331 in words is "twenty-one billion, two hundred three million, one hundred ten thousand, three hundred thirty-one".