21246181216 has 96 divisors (see below), whose sum is σ = 47518984800. Its totient is φ = 9269821440.

The previous prime is 21246181213. The next prime is 21246181249. The reversal of 21246181216 is 61218164212.

It is a super-2 number, since 2×21246181216² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246181213) 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, 4020496 + ... + 4025776.

It is an arithmetic number, because the mean of its divisors is an integer number (494989425).

Almost surely, 2^21246181216 is an apocalyptic number.

21246181216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21246181216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23759492400).

21246181216 is an abundant number, since it is smaller than the sum of its proper divisors (26272803584).

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

21246181216 is a wasteful number, since it uses less digits than its factorization.

21246181216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5832 (or 5824 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The spelling of 21246181216 in words is "twenty-one billion, two hundred forty-six million, one hundred eighty-one thousand, two hundred sixteen".