21221222121011 has 8 divisors (see below), whose sum is σ = 23151453264048. Its totient is φ = 19291162500000.

The previous prime is 21221222120993. The next prime is 21221222121049. The reversal of 21221222121011 is 11012122212212.

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 21221222121011 - 2²⁶ = 21221155012147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221222123011) 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, 42621740 + ... + 43116761.

It is an arithmetic number, because the mean of its divisors is an integer number (2893931658006).

Almost surely, 2^{21221222121011} is an apocalyptic number.

21221222121011 is a deficient number, since it is larger than the sum of its proper divisors (1930231143037).

21221222121011 is a wasteful number, since it uses less digits than its factorization.

21221222121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85761013.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21221222121011 its reverse (11012122212212), we get a palindrome (32233344333223).

The spelling of 21221222121011 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, eleven".