221500106605220 has 12 divisors (see below), whose sum is σ = 465150223871004. Its totient is φ = 88600042642080.

The previous prime is 221500106605207. The next prime is 221500106605249. The reversal of 221500106605220 is 22506601005122.

It can be written as a sum of positive squares in 2 ways, for example, as 81789739637824 + 139710366967396 = 9043768^2 + 11819914^2 .

It is a super-2 number, since 2×221500106605220² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5537502665111 + ... + 5537502665150.

It is an arithmetic number, because the mean of its divisors is an integer number (38762518655917).

Almost surely, 2^{221500106605220} is an apocalyptic number.

221500106605220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221500106605220 is an abundant number, since it is smaller than the sum of its proper divisors (243650117265784).

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

221500106605220 is a wasteful number, since it uses less digits than its factorization.

221500106605220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11075005330270 (or 11075005330268 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 221500106605220 in words is "two hundred twenty-one trillion, five hundred billion, one hundred six million, six hundred five thousand, two hundred twenty".