221651365710550 has 48 divisors (see below), whose sum is σ = 412371483660864. Its totient is φ = 88639056000000.

The previous prime is 221651365710443. The next prime is 221651365710581. The reversal of 221651365710550 is 55017563156122.

It is a junction number, because it is equal to n+sod(n) for n = 221651365710494 and 221651365710503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4015322950 + ... + 4015378150.

It is an arithmetic number, because the mean of its divisors is an integer number (8591072576268).

Almost surely, 2^{221651365710550} is an apocalyptic number.

221651365710550 is a deficient number, since it is larger than the sum of its proper divisors (190720117950314).

221651365710550 is a wasteful number, since it uses less digits than its factorization.

221651365710550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73225 (or 73220 counting only the distinct ones).

The product of its (nonzero) digits is 1890000, while the sum is 49.

The spelling of 221651365710550 in words is "two hundred twenty-one trillion, six hundred fifty-one billion, three hundred sixty-five million, seven hundred ten thousand, five hundred fifty".