21418896113 has 4 divisors (see below), whose sum is σ = 21435111588. Its totient is φ = 21402680640.

The previous prime is 21418896101. The next prime is 21418896143. The reversal of 21418896113 is 31169881412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20008668304 + 1410227809 = 141452^2 + 37553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21418896113 is a prime.

It is a super-2 number, since 2×21418896113² (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 (21418896143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8105756 + ... + 8108397.

It is an arithmetic number, because the mean of its divisors is an integer number (5358777897).

Almost surely, 2^21418896113 is an apocalyptic number.

It is an amenable number.

21418896113 is a deficient number, since it is larger than the sum of its proper divisors (16215475).

21418896113 is a wasteful number, since it uses less digits than its factorization.

21418896113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16215474.

The product of its digits is 82944, while the sum is 44.

The spelling of 21418896113 in words is "twenty-one billion, four hundred eighteen million, eight hundred ninety-six thousand, one hundred thirteen".