1221211804 has 12 divisors (see below), whose sum is σ = 2137807504. Its totient is φ = 610409664.

The previous prime is 1221211801. The next prime is 1221211867. The reversal of 1221211804 is 4081121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211801) 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, 34584 + ... + 60319.

Almost surely, 2^1221211804 is an apocalyptic number.

It is an amenable number.

1221211804 is a deficient number, since it is larger than the sum of its proper divisors (916595700).

1221211804 is a wasteful number, since it uses less digits than its factorization.

1221211804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98124 (or 98122 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1221211804 is about 34945.8410114852. The cubic root of 1221211804 is about 1068.8833968486.

The spelling of 1221211804 in words is "one billion, two hundred twenty-one million, two hundred eleven thousand, eight hundred four".