21775722132156 has 24 divisors (see below), whose sum is σ = 50814687364224. Its totient is φ = 7257907036080.

The previous prime is 21775722132107. The next prime is 21775722132161. The reversal of 21775722132156 is 65123122757712.

It is a junction number, because it is equal to n+sod(n) for n = 21775722132099 and 21775722132108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83239960 + ... + 83501151.

It is an arithmetic number, because the mean of its divisors is an integer number (2117278640176).

Almost surely, 2^{21775722132156} is an apocalyptic number.

It is an amenable number.

21775722132156 is an abundant number, since it is smaller than the sum of its proper divisors (29038965232068).

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

21775722132156 is a wasteful number, since it uses less digits than its factorization.

21775722132156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166752001 (or 166751999 counting only the distinct ones).

The product of its digits is 2469600, while the sum is 51.

Adding to 21775722132156 its reverse (65123122757712), we get a palindrome (86898844889868).

The spelling of 21775722132156 in words is "twenty-one trillion, seven hundred seventy-five billion, seven hundred twenty-two million, one hundred thirty-two thousand, one hundred fifty-six".