21212012212000 has 96 divisors (see below), whose sum is σ = 52122117391344. Its totient is φ = 8484120576000.

The previous prime is 21212012211997. The next prime is 21212012212073. The reversal of 21212012212000 is 21221021212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1576159724304 + 19635852487696 = 1255452^2 + 4431236^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50916544 + ... + 51331456.

Almost surely, 2^{21212012212000} is an apocalyptic number.

21212012212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212012212000 is an abundant number, since it is smaller than the sum of its proper divisors (30910105179344).

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

21212012212000 is a wasteful number, since it uses less digits than its factorization.

21212012212000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427719 (or 427701 counting only the distinct ones).

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

Adding to 21212012212000 its reverse (21221021212), we get a palindrome (21233233233212).

The spelling of 21212012212000 in words is "twenty-one trillion, two hundred twelve billion, twelve million, two hundred twelve thousand".