21015223113 has 16 divisors (see below), whose sum is σ = 29115748352. Its totient is φ = 13468410000.

The previous prime is 21015223091. The next prime is 21015223121. The reversal of 21015223113 is 31132251012.

It is not a de Polignac number, because 21015223113 - 2¹⁰ = 21015222089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21015223113.

It is not an unprimeable number, because it can be changed into a prime (21015223193) 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, 734203 + ... + 762288.

It is an arithmetic number, because the mean of its divisors is an integer number (1819734272).

Almost surely, 2^21015223113 is an apocalyptic number.

It is an amenable number.

21015223113 is a deficient number, since it is larger than the sum of its proper divisors (8100525239).

21015223113 is a wasteful number, since it uses less digits than its factorization.

21015223113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496676.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21015223113 its reverse (31132251012), we get a palindrome (52147474125).

The spelling of 21015223113 in words is "twenty-one billion, fifteen million, two hundred twenty-three thousand, one hundred thirteen".