21611775321276 has 96 divisors (see below), whose sum is σ = 58023456906240. Its totient is φ = 6132801600000.

The previous prime is 21611775321259. The next prime is 21611775321277. The reversal of 21611775321276 is 67212357711612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611775321277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72009526 + ... + 72309026.

It is an arithmetic number, because the mean of its divisors is an integer number (604411009440).

Almost surely, 2^{21611775321276} 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 21611775321276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29011728453120).

21611775321276 is an abundant number, since it is smaller than the sum of its proper divisors (36411681584964).

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

21611775321276 is a wasteful number, since it uses less digits than its factorization.

21611775321276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305355 (or 305353 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 51.

The spelling of 21611775321276 in words is "twenty-one trillion, six hundred eleven billion, seven hundred seventy-five million, three hundred twenty-one thousand, two hundred seventy-six".