2121210121212 has 432 divisors, whose sum is σ = 6869502581760. Its totient is φ = 537340137984.

The previous prime is 2121210121211. The next prime is 2121210121229.

2121210121212 is a `hidden beast` number, since 2 + 121 + 210 + 121 + 212 = 666.

2121210121212 is nontrivially palindromic in base 10.

2121210121212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a super-3 number, since 3×2121210121212³ (a number of 38 digits) contains 333 as substring.

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

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121210121211) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 354299683 + ... + 354305669.

Almost surely, 2^{2121210121212} 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 2121210121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3434751290880).

2121210121212 is an abundant number, since it is smaller than the sum of its proper divisors (4748292460548).

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

2121210121212 is a wasteful number, since it uses less digits than its factorization.

2121210121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6170 (or 6128 counting only the distinct ones).

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

It can be divided in two parts, 2121210 and 121212, that added together give a palindrome (2242422).

The spelling of 2121210121212 in words is "two trillion, one hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twelve".