21310203211 has 16 divisors (see below), whose sum is σ = 23488932096. Its totient is φ = 19171900000.

The previous prime is 21310203199. The next prime is 21310203223. The reversal of 21310203211 is 11230201312.

It is an interprime number because it is at equal distance from previous prime (21310203199) and next prime (21310203223).

It is not a de Polignac number, because 21310203211 - 2⁹ = 21310202699 is a prime.

It is a super-2 number, since 2×21310203211² (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 (21310207211) 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, 3542196 + ... + 3548206.

It is an arithmetic number, because the mean of its divisors is an integer number (1468058256).

Almost surely, 2^21310203211 is an apocalyptic number.

21310203211 is a deficient number, since it is larger than the sum of its proper divisors (2178728885).

21310203211 is a wasteful number, since it uses less digits than its factorization.

21310203211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9314.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21310203211 its reverse (11230201312), we get a palindrome (32540404523).

The spelling of 21310203211 in words is "twenty-one billion, three hundred ten million, two hundred three thousand, two hundred eleven".