221423829512 has 108 divisors (see below), whose sum is σ = 439236263655. Its totient is φ = 104643512064.

The previous prime is 221423829509. The next prime is 221423829521. The reversal of 221423829512 is 215928324122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 172611997156 + 48811832356 = 415466^2 + 220934^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332734.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221423829512.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3033203108 + ... + 3033203180.

Almost surely, 2^221423829512 is an apocalyptic number.

It is an amenable number.

221423829512 is a deficient number, since it is larger than the sum of its proper divisors (217812434143).

221423829512 is an frugal number, since it uses more digits than its factorization.

221423829512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 171 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The spelling of 221423829512 in words is "two hundred twenty-one billion, four hundred twenty-three million, eight hundred twenty-nine thousand, five hundred twelve".