221010012221 has 4 divisors (see below), whose sum is σ = 222155142012. Its totient is φ = 219864882432.

The previous prime is 221010012211. The next prime is 221010012239. The reversal of 221010012221 is 122210010122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54228436900 + 166781575321 = 232870^2 + 408389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221010012221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221010012196 and 221010012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010012211) 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, 572564606 + ... + 572564991.

It is an arithmetic number, because the mean of its divisors is an integer number (55538785503).

Almost surely, 2^221010012221 is an apocalyptic number.

It is an amenable number.

221010012221 is a deficient number, since it is larger than the sum of its proper divisors (1145129791).

221010012221 is a wasteful number, since it uses less digits than its factorization.

221010012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145129790.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221010012221 its reverse (122210010122), we get a palindrome (343220022343).

The spelling of 221010012221 in words is "two hundred twenty-one billion, ten million, twelve thousand, two hundred twenty-one".