221009436730 has 8 divisors (see below), whose sum is σ = 397816986132. Its totient is φ = 88403774688.

The previous prime is 221009436721. The next prime is 221009436737. The reversal of 221009436730 is 37634900122.

It can be written as a sum of positive squares in 2 ways, for example, as 220389874849 + 619561881 = 469457^2 + 24891^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×221009436730² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221009436730.

It is not an unprimeable number, because it can be changed into a prime (221009436737) by changing a digit.

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, 11050471827 + ... + 11050471846.

Almost surely, 2^221009436730 is an apocalyptic number.

221009436730 is a deficient number, since it is larger than the sum of its proper divisors (176807549402).

221009436730 is a wasteful number, since it uses less digits than its factorization.

221009436730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22100943680.

The product of its (nonzero) digits is 54432, while the sum is 37.

The spelling of 221009436730 in words is "two hundred twenty-one billion, nine million, four hundred thirty-six thousand, seven hundred thirty".