21121526613313 has 8 divisors (see below), whose sum is σ = 24631517916800. Its totient is φ = 18104165668260.

The previous prime is 21121526613293. The next prime is 21121526613401. The reversal of 21121526613313 is 31331662512112.

It is a de Polignac number, because none of the positive numbers 2^k-21121526613313 is a prime.

It is a super-2 number, since 2×21121526613313² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121526613713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30789397053 + ... + 30789397738.

It is an arithmetic number, because the mean of its divisors is an integer number (3078939739600).

Almost surely, 2^{21121526613313} is an apocalyptic number.

It is an amenable number.

21121526613313 is a deficient number, since it is larger than the sum of its proper divisors (3509991303487).

21121526613313 is an frugal number, since it uses more digits than its factorization.

21121526613313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61578794812 (or 61578794798 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The spelling of 21121526613313 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred twenty-six million, six hundred thirteen thousand, three hundred thirteen".