21203303311 has 16 divisors (see below), whose sum is σ = 22185529344. Its totient is φ = 20244407904.

The previous prime is 21203303309. The next prime is 21203303321. The reversal of 21203303311 is 11330330212.

It is a cyclic number.

It is not a de Polignac number, because 21203303311 - 2¹ = 21203303309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203303321) 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, 1738045 + ... + 1750201.

It is an arithmetic number, because the mean of its divisors is an integer number (1386595584).

Almost surely, 2^21203303311 is an apocalyptic number.

21203303311 is a deficient number, since it is larger than the sum of its proper divisors (982226033).

21203303311 is a wasteful number, since it uses less digits than its factorization.

21203303311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13110.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21203303311 its reverse (11330330212), we get a palindrome (32533633523).

The spelling of 21203303311 in words is "twenty-one billion, two hundred three million, three hundred three thousand, three hundred eleven".