21220121102011 has 16 divisors (see below), whose sum is σ = 23912445957120. Its totient is φ = 18683970481440.

The previous prime is 21220121101979. The next prime is 21220121102041. The reversal of 21220121102011 is 11020112102212.

It is a cyclic number.

It is not a de Polignac number, because 21220121102011 - 2⁵ = 21220121101979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220121102041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98737095 + ... + 98951776.

It is an arithmetic number, because the mean of its divisors is an integer number (1494527872320).

Almost surely, 2^{21220121102011} is an apocalyptic number.

21220121102011 is a deficient number, since it is larger than the sum of its proper divisors (2692324855109).

21220121102011 is a wasteful number, since it uses less digits than its factorization.

21220121102011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197689266.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220121102011 its reverse (11020112102212), we get a palindrome (32240233204223).

The spelling of 21220121102011 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred two thousand, eleven".