21211211001212 has 12 divisors (see below), whose sum is σ = 37748765341560. Its totient is φ = 10425849475056.

The previous prime is 21211211001181. The next prime is 21211211001221. The reversal of 21211211001212 is 21210011211212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44939006123 + ... + 44939006594.

It is an arithmetic number, because the mean of its divisors is an integer number (3145730445130).

Almost surely, 2^{21211211001212} is an apocalyptic number.

It is an amenable number.

21211211001212 is a deficient number, since it is larger than the sum of its proper divisors (16537554340348).

21211211001212 is a wasteful number, since it uses less digits than its factorization.

21211211001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89878012780 (or 89878012778 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21211211001212 its reverse (21210011211212), we get a palindrome (42421222212424).

The spelling of 21211211001212 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, one thousand, two hundred twelve".