21212001210212 has 96 divisors (see below), whose sum is σ = 38089295244000. Its totient is φ = 10333893427200.

The previous prime is 21212001210199. The next prime is 21212001210217. The reversal of 21212001210212 is 21201210021212.

It can be written as a sum of positive squares in 16 ways, for example, as 7425973804096 + 13786027406116 = 2725064^2 + 3712954^2 .

It is a super-2 number, since 2×21212001210212² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212001210217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5719060214 + ... + 5719063922.

It is an arithmetic number, because the mean of its divisors is an integer number (396763492125).

Almost surely, 2^{21212001210212} is an apocalyptic number.

It is an amenable number.

21212001210212 is a deficient number, since it is larger than the sum of its proper divisors (16877294033788).

21212001210212 is a wasteful number, since it uses less digits than its factorization.

21212001210212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4657 (or 4655 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212001210212 its reverse (21201210021212), we get a palindrome (42413211231424).

The spelling of 21212001210212 in words is "twenty-one trillion, two hundred twelve billion, one million, two hundred ten thousand, two hundred twelve".