221030012221 has 4 divisors (see below), whose sum is σ = 222140716000. Its totient is φ = 219919308444.

The previous prime is 221030012207. The next prime is 221030012227. The reversal of 221030012221 is 122210030122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221030012221 - 2³¹ = 218882528573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221030012195 and 221030012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221030012227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555351591 + ... + 555351988.

It is an arithmetic number, because the mean of its divisors is an integer number (55535179000).

Almost surely, 2^221030012221 is an apocalyptic number.

It is an amenable number.

221030012221 is a deficient number, since it is larger than the sum of its proper divisors (1110703779).

221030012221 is a wasteful number, since it uses less digits than its factorization.

221030012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110703778.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221030012221 its reverse (122210030122), we get a palindrome (343240042343).

The spelling of 221030012221 in words is "two hundred twenty-one billion, thirty million, twelve thousand, two hundred twenty-one".