21517740425116 has 24 divisors (see below), whose sum is σ = 40559831249840. Its totient is φ = 9929509725312.

The previous prime is 21517740425087. The next prime is 21517740425119. The reversal of 21517740425116 is 61152404771512.

It is a super-2 number, since 2×21517740425116² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21517740425119) 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, 36267201 + ... + 36855736.

Almost surely, 2^{21517740425116} is an apocalyptic number.

21517740425116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21517740425116 is a deficient number, since it is larger than the sum of its proper divisors (19042090824724).

21517740425116 is a wasteful number, since it uses less digits than its factorization.

21517740425116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73128613 (or 73128611 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 21517740425116 in words is "twenty-one trillion, five hundred seventeen billion, seven hundred forty million, four hundred twenty-five thousand, one hundred sixteen".