21111212010211 has 8 divisors (see below), whose sum is σ = 21262200514848. Its totient is φ = 20960370600000.

The previous prime is 21111212010193. The next prime is 21111212010223. The reversal of 21111212010211 is 11201021211112.

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 21111212010211 - 2¹³ = 21111212002019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111212010241) 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, 36485530 + ... + 37059631.

It is an arithmetic number, because the mean of its divisors is an integer number (2657775064356).

Almost surely, 2^{21111212010211} is an apocalyptic number.

21111212010211 is a deficient number, since it is larger than the sum of its proper divisors (150988504637).

21111212010211 is a wasteful number, since it uses less digits than its factorization.

21111212010211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73547213.

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

Adding to 21111212010211 its reverse (11201021211112), we get a palindrome (32312233221323).

The spelling of 21111212010211 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, ten thousand, two hundred eleven".