21121320303111 has 16 divisors (see below), whose sum is σ = 32203548641024. Its totient is φ = 12062321034624.

The previous prime is 21121320303091. The next prime is 21121320303157. The reversal of 21121320303111 is 11130302312112.

It is not a de Polignac number, because 21121320303111 - 2⁷ = 21121320302983 is a prime.

It is a super-2 number, since 2×21121320303111² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121320303191) 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, 291831826 + ... + 291904191.

It is an arithmetic number, because the mean of its divisors is an integer number (2012721790064).

Almost surely, 2^{21121320303111} is an apocalyptic number.

21121320303111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21121320303111 is a deficient number, since it is larger than the sum of its proper divisors (11082228337913).

21121320303111 is a wasteful number, since it uses less digits than its factorization.

21121320303111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583737750.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21121320303111 its reverse (11130302312112), we get a palindrome (32251622615223).

The spelling of 21121320303111 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twenty million, three hundred three thousand, one hundred eleven".