20112121201212 has 144 divisors (see below), whose sum is σ = 52341326672544. Its totient is φ = 6506832384000.

The previous prime is 20112121201169. The next prime is 20112121201241. The reversal of 20112121201212 is 21210212121102.

20112121201212 is a `hidden beast` number, since 20 + 112 + 121 + 201 + 212 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1499666787 + ... + 1499680197.

It is an arithmetic number, because the mean of its divisors is an integer number (363481435226).

Almost surely, 2^{20112121201212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20112121201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26170663336272).

20112121201212 is an abundant number, since it is smaller than the sum of its proper divisors (32229205471332).

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

20112121201212 is a wasteful number, since it uses less digits than its factorization.

20112121201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16140 (or 16135 counting only the distinct ones).

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

Adding to 20112121201212 its reverse (21210212121102), we get a palindrome (41322333322314).

The spelling of 20112121201212 in words is "twenty trillion, one hundred twelve billion, one hundred twenty-one million, two hundred one thousand, two hundred twelve".