221012030321 has 8 divisors (see below), whose sum is σ = 222352463424. Its totient is φ = 219672909360.

The previous prime is 221012030263. The next prime is 221012030357. The reversal of 221012030321 is 123030210122.

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

It is a cyclic number.

It is not a de Polignac number, because 221012030321 - 2²² = 221007836017 is a prime.

It is a super-2 number, since 2×221012030321² (a number of 23 digits) contains 22 as substring.

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 221012030321.

It is not an unprimeable number, because it can be changed into a prime (221012030621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10916 + ... + 664938.

It is an arithmetic number, because the mean of its divisors is an integer number (27794057928).

Almost surely, 2^221012030321 is an apocalyptic number.

It is an amenable number.

221012030321 is a deficient number, since it is larger than the sum of its proper divisors (1340433103).

221012030321 is a wasteful number, since it uses less digits than its factorization.

221012030321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656071.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 221012030321 its reverse (123030210122), we get a palindrome (344042240443).

The spelling of 221012030321 in words is "two hundred twenty-one billion, twelve million, thirty thousand, three hundred twenty-one".