21100220121011 has 8 divisors (see below), whose sum is σ = 22354301325024. Its totient is φ = 19847571337600.

The previous prime is 21100220120999. The next prime is 21100220121017. The reversal of 21100220121011 is 11012102200112.

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 21100220121011 - 2⁴² = 16702173609907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100220121017) 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, 358074815 + ... + 358133736.

It is an arithmetic number, because the mean of its divisors is an integer number (2794287665628).

Almost surely, 2^{21100220121011} is an apocalyptic number.

21100220121011 is a deficient number, since it is larger than the sum of its proper divisors (1254081204013).

21100220121011 is a wasteful number, since it uses less digits than its factorization.

21100220121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716210301.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21100220121011 its reverse (11012102200112), we get a palindrome (32112322321123).

The spelling of 21100220121011 in words is "twenty-one trillion, one hundred billion, two hundred twenty million, one hundred twenty-one thousand, eleven".