21212032212 has 216 divisors, whose sum is σ = 64944052992. Its totient is φ = 5717692800.

The previous prime is 21212032211. The next prime is 21212032229. The reversal of 21212032212 is 21223021212.

21212032212 is a `hidden beast` number, since 212 + 120 + 322 + 12 = 666.

It is a super-2 number, since 2×21212032212² (a number of 21 digits) contains 22 as substring.

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 (21212032211) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 39208662 + ... + 39209202.

It is an arithmetic number, because the mean of its divisors is an integer number (300666912).

Almost surely, 2^21212032212 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 21212032212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32472026496).

21212032212 is an abundant number, since it is smaller than the sum of its proper divisors (43732020780).

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

21212032212 is a wasteful number, since it uses less digits than its factorization.

21212032212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21212032212 its reverse (21223021212), we get a palindrome (42435053424).

The spelling of 21212032212 in words is "twenty-one billion, two hundred twelve million, thirty-two thousand, two hundred twelve".