21221111011011 has 8 divisors (see below), whose sum is σ = 28376355935424. Its totient is φ = 14106636713640.

The previous prime is 21221111010989. The next prime is 21221111011057. The reversal of 21221111011011 is 11011011112212.

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

It is a de Polignac number, because none of the positive numbers 2^k-21221111011011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221111061011) 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, 10192655545 + ... + 10192657626.

It is an arithmetic number, because the mean of its divisors is an integer number (3547044491928).

Almost surely, 2^{21221111011011} is an apocalyptic number.

21221111011011 is a deficient number, since it is larger than the sum of its proper divisors (7155244924413).

21221111011011 is a wasteful number, since it uses less digits than its factorization.

21221111011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20385313521.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21221111011011 its reverse (11011011112212), we get a palindrome (32232122123223).

The spelling of 21221111011011 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, eleven thousand, eleven".