21144113221111 has 12 divisors (see below), whose sum is σ = 22333929674952. Its totient is φ = 20014750921104.

The previous prime is 21144113221081. The next prime is 21144113221117. The reversal of 21144113221111 is 11112231144112.

It is not a de Polignac number, because 21144113221111 - 2¹³ = 21144113212919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144113221117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23705121 + ... + 24580906.

It is an arithmetic number, because the mean of its divisors is an integer number (1861160806246).

Almost surely, 2^{21144113221111} is an apocalyptic number.

21144113221111 is a deficient number, since it is larger than the sum of its proper divisors (1189816453841).

21144113221111 is a wasteful number, since it uses less digits than its factorization.

21144113221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48287278 (or 48287259 counting only the distinct ones).

The product of its digits is 384, while the sum is 25.

Adding to 21144113221111 its reverse (11112231144112), we get a palindrome (32256344365223).

The spelling of 21144113221111 in words is "twenty-one trillion, one hundred forty-four billion, one hundred thirteen million, two hundred twenty-one thousand, one hundred eleven".