21021021212 has 12 divisors (see below), whose sum is σ = 38386212816. Its totient is φ = 10053531840.

The previous prime is 21021021199. The next prime is 21021021269. The reversal of 21021021212 is 21212012012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114244589 + ... + 114244772.

It is an arithmetic number, because the mean of its divisors is an integer number (3198851068).

Almost surely, 2^21021021212 is an apocalyptic number.

It is an amenable number.

21021021212 is a deficient number, since it is larger than the sum of its proper divisors (17365191604).

21021021212 is a wasteful number, since it uses less digits than its factorization.

21021021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228489388 (or 228489386 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021021212 its reverse (21212012012), we get a palindrome (42233033224).

The spelling of 21021021212 in words is "twenty-one billion, twenty-one million, twenty-one thousand, two hundred twelve".