21113110311 has 32 divisors (see below), whose sum is σ = 29753146368. Its totient is φ = 13300859520.

The previous prime is 21113110303. The next prime is 21113110313. The reversal of 21113110311 is 11301131112.

It is not a de Polignac number, because 21113110311 - 2³ = 21113110303 is a prime.

It is a super-3 number, since 3×21113110311³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113110313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 667981 + ... + 698873.

It is an arithmetic number, because the mean of its divisors is an integer number (929785824).

Almost surely, 2^21113110311 is an apocalyptic number.

21113110311 is a deficient number, since it is larger than the sum of its proper divisors (8640036057).

21113110311 is a wasteful number, since it uses less digits than its factorization.

21113110311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31111.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 21113110311 its reverse (11301131112), we get a palindrome (32414241423).

The spelling of 21113110311 in words is "twenty-one billion, one hundred thirteen million, one hundred ten thousand, three hundred eleven".