222121210004 has 12 divisors (see below), whose sum is σ = 388734093300. Its totient is φ = 111054326208.

The previous prime is 222121209949. The next prime is 222121210009. The reversal of 222121210004 is 400012121222.

It can be written as a sum of positive squares in 2 ways, for example, as 190043683600 + 32077526404 = 435940^2 + 179102^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121210009) 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, 1489649 + ... + 1631960.

It is an arithmetic number, because the mean of its divisors is an integer number (32394507775).

Almost surely, 2^222121210004 is an apocalyptic number.

It is an amenable number.

222121210004 is a deficient number, since it is larger than the sum of its proper divisors (166612883296).

222121210004 is a wasteful number, since it uses less digits than its factorization.

222121210004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139402 (or 3139400 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222121210004 its reverse (400012121222), we get a palindrome (622133331226).

The spelling of 222121210004 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred ten thousand, four".