21212001012212 has 12 divisors (see below), whose sum is σ = 37173358619460. Its totient is φ = 10591041406656.

The previous prime is 21212001012199. The next prime is 21212001012217. The reversal of 21212001012212 is 21221010021212.

It can be written as a sum of positive squares in 2 ways, for example, as 3874071046756 + 17337929965456 = 1968266^2 + 4163884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212001012217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3739771673 + ... + 3739777344.

It is an arithmetic number, because the mean of its divisors is an integer number (3097779884955).

Almost surely, 2^{21212001012212} is an apocalyptic number.

It is an amenable number.

21212001012212 is a deficient number, since it is larger than the sum of its proper divisors (15961357607248).

21212001012212 is a wasteful number, since it uses less digits than its factorization.

21212001012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7479549730 (or 7479549728 counting only the distinct ones).

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

Adding to 21212001012212 its reverse (21221010021212), we get a palindrome (42433011033424).

The spelling of 21212001012212 in words is "twenty-one trillion, two hundred twelve billion, one million, twelve thousand, two hundred twelve".