21220121010111 has 8 divisors (see below), whose sum is σ = 28293636134400. Its totient is φ = 14146676612952.

The previous prime is 21220121010089. The next prime is 21220121010131. The reversal of 21220121010111 is 11101012102212.

It is a happy number.

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

It is not a de Polignac number, because 21220121010111 - 2⁹ = 21220121009599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220121010131) 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, 16977711 + ... + 18184688.

It is an arithmetic number, because the mean of its divisors is an integer number (3536704516800).

Almost surely, 2^{21220121010111} is an apocalyptic number.

21220121010111 is a deficient number, since it is larger than the sum of its proper divisors (7073515124289).

21220121010111 is a wasteful number, since it uses less digits than its factorization.

21220121010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35363565.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21220121010111 its reverse (11101012102212), we get a palindrome (32321133112323).

The spelling of 21220121010111 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, ten thousand, one hundred eleven".