21212000021212 has 192 divisors, whose sum is σ = 52474873651200. Its totient is φ = 7225680971520.

The previous prime is 21212000021203. The next prime is 21212000021243.

It is a happy number.

21212000021212 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 403404739 + ... + 403457317.

It is an arithmetic number, because the mean of its divisors is an integer number (273306633600).

Almost surely, 2^{21212000021212} is an apocalyptic number.

21212000021212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212000021212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26237436825600).

21212000021212 is an abundant number, since it is smaller than the sum of its proper divisors (31262873629988).

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

21212000021212 is a wasteful number, since it uses less digits than its factorization.

21212000021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57936 (or 57934 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

It can be divided in two parts, 212120000 and 21212, that multiplied together give a square (4499489440000 = 2121200²).

The spelling of 21212000021212 in words is "twenty-one trillion, two hundred twelve billion, twenty-one thousand, two hundred twelve".