2221212004 has 18 divisors (see below), whose sum is σ = 4272621542. Its totient is φ = 1009641600.

The previous prime is 2221211977. The next prime is 2221212011. The reversal of 2221212004 is 4002121222.

It can be written as a sum of positive squares in only one way, i.e., 1155320100 + 1065891904 = 33990^2 + 32648^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2294157 + ... + 2295124.

Almost surely, 2^2221212004 is an apocalyptic number.

It is an amenable number.

2221212004 is a deficient number, since it is larger than the sum of its proper divisors (2051409538).

2221212004 is a wasteful number, since it uses less digits than its factorization.

2221212004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4589307 (or 4589294 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2221212004 is about 47129.7358787422. The cubic root of 2221212004 is about 1304.7581068860.

Adding to 2221212004 its reverse (4002121222), we get a palindrome (6223333226).

The spelling of 2221212004 in words is "two billion, two hundred twenty-one million, two hundred twelve thousand, four".