21007174896 has 120 divisors (see below), whose sum is σ = 63202264320. Its totient is φ = 6492659328.

The previous prime is 21007174883. The next prime is 21007174963. The reversal of 21007174896 is 69847170012.

It is a happy number.

It is a super-2 number, since 2×21007174896² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46911 + ... + 210273.

It is an arithmetic number, because the mean of its divisors is an integer number (526685536).

Almost surely, 2^21007174896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21007174896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31601132160).

21007174896 is an abundant number, since it is smaller than the sum of its proper divisors (42195089424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21007174896 is a wasteful number, since it uses less digits than its factorization.

21007174896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163443 (or 163434 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 21007174896 in words is "twenty-one billion, seven million, one hundred seventy-four thousand, eight hundred ninety-six".