20121220204 has 6 divisors (see below), whose sum is σ = 35212135364. Its totient is φ = 10060610100.

The previous prime is 20121220187. The next prime is 20121220241. The reversal of 20121220204 is 40202212102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2515152522 + ... + 2515152529.

Almost surely, 2^20121220204 is an apocalyptic number.

It is an amenable number.

20121220204 is a deficient number, since it is larger than the sum of its proper divisors (15090915160).

20121220204 is a wasteful number, since it uses less digits than its factorization.

20121220204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030305055 (or 5030305053 counting only the distinct ones).

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

Adding to 20121220204 its reverse (40202212102), we get a palindrome (60323432306).

The spelling of 20121220204 in words is "twenty billion, one hundred twenty-one million, two hundred twenty thousand, two hundred four".