21520561776222 has 16 divisors (see below), whose sum is σ = 43041287485440. Its totient is φ = 7173493269912.

The previous prime is 21520561776221. The next prime is 21520561776317. The reversal of 21520561776222 is 22267716502512.

It is a super-3 number, since 3×21520561776222³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520561776221) 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, 5089822 + ... + 8303457.

It is an arithmetic number, because the mean of its divisors is an integer number (2690080467840).

Almost surely, 2^{21520561776222} is an apocalyptic number.

21520561776222 is an abundant number, since it is smaller than the sum of its proper divisors (21520725709218).

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

21520561776222 is a wasteful number, since it uses less digits than its factorization.

21520561776222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13661087.

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 21520561776222 in words is "twenty-one trillion, five hundred twenty billion, five hundred sixty-one million, seven hundred seventy-six thousand, two hundred twenty-two".