21212112001111 has 8 divisors (see below), whose sum is σ = 22460776323984. Its totient is φ = 19963546903680.

The previous prime is 21212112001103. The next prime is 21212112001121. The reversal of 21212112001111 is 11110021121212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212112001111 - 2³ = 21212112001103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212112001121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24366000 + ... + 25221541.

It is an arithmetic number, because the mean of its divisors is an integer number (2807597040498).

Almost surely, 2^{21212112001111} is an apocalyptic number.

21212112001111 is a deficient number, since it is larger than the sum of its proper divisors (1248664322873).

21212112001111 is a wasteful number, since it uses less digits than its factorization.

21212112001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49612721.

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

Adding to 21212112001111 its reverse (11110021121212), we get a palindrome (32322133122323).

The spelling of 21212112001111 in words is "twenty-one trillion, two hundred twelve billion, one hundred twelve million, one thousand, one hundred eleven".