21021111223211 has 8 divisors (see below), whose sum is σ = 22933545617664. Its totient is φ = 19108914209320.

The previous prime is 21021111223207. The next prime is 21021111223223. The reversal of 21021111223211 is 11232211112012.

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 21021111223211 - 2² = 21021111223207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021111223111) 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, 59159951 + ... + 59514216.

It is an arithmetic number, because the mean of its divisors is an integer number (2866693202208).

Almost surely, 2^{21021111223211} is an apocalyptic number.

21021111223211 is a deficient number, since it is larger than the sum of its proper divisors (1912434394453).

21021111223211 is a wasteful number, since it uses less digits than its factorization.

21021111223211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118690281.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21021111223211 its reverse (11232211112012), we get a palindrome (32253322335223).

The spelling of 21021111223211 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred twenty-three thousand, two hundred eleven".