20111210121204 has 72 divisors (see below), whose sum is σ = 53095560292320. Its totient is φ = 6412002835392.

The previous prime is 20111210121203. The next prime is 20111210121287. The reversal of 20111210121204 is 40212101211102.

20111210121204 is a `hidden beast` number, since 20 + 111 + 210 + 121 + 204 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111210121203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127874854 + ... + 128032029.

Almost surely, 2^{20111210121204} is an apocalyptic number.

It is an amenable number.

20111210121204 is an abundant number, since it is smaller than the sum of its proper divisors (32984350171116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111210121204 is a wasteful number, since it uses less digits than its factorization.

20111210121204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255906989 (or 255906984 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20111210121204 its reverse (40212101211102), we get a palindrome (60323311332306).

The spelling of 20111210121204 in words is "twenty trillion, one hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, two hundred four".