20212001221212 has 72 divisors (see below), whose sum is σ = 52492940275776. Its totient is φ = 6552664781184.

The previous prime is 20212001221211. The next prime is 20212001221231. The reversal of 20212001221212 is 21212210021202.

It is a happy number.

20212001221212 is a `hidden beast` number, since 20 + 212 + 0 + 0 + 1 + 221 + 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 not an unprimeable number, because it can be changed into a prime (20212001221211) 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, 403758 + ... + 6370794.

Almost surely, 2^{20212001221212} 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 20212001221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26246470137888).

20212001221212 is an abundant number, since it is smaller than the sum of its proper divisors (32280939054564).

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

20212001221212 is a wasteful number, since it uses less digits than its factorization.

20212001221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969627 (or 5969622 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20212001221212 its reverse (21212210021202), we get a palindrome (41424211242414).

The spelling of 20212001221212 in words is "twenty trillion, two hundred twelve billion, one million, two hundred twenty-one thousand, two hundred twelve".