221617776356 has 6 divisors (see below), whose sum is σ = 387831108630. Its totient is φ = 110808888176.

The previous prime is 221617776349. The next prime is 221617776377. The reversal of 221617776356 is 653677716122.

It can be written as a sum of positive squares in only one way, i.e., 194595676900 + 27022099456 = 441130^2 + 164384^2 .

It is a super-2 number, since 2×221617776356² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221617776298 and 221617776307.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27702222041 + ... + 27702222048.

It is an arithmetic number, because the mean of its divisors is an integer number (64638518105).

Almost surely, 2^221617776356 is an apocalyptic number.

It is an amenable number.

221617776356 is a deficient number, since it is larger than the sum of its proper divisors (166213332274).

221617776356 is a wasteful number, since it uses less digits than its factorization.

221617776356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55404444093 (or 55404444091 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 53.

The spelling of 221617776356 in words is "two hundred twenty-one billion, six hundred seventeen million, seven hundred seventy-six thousand, three hundred fifty-six".