21230131222111 has 16 divisors (see below), whose sum is σ = 24297584905984. Its totient is φ = 18171334044864.

The previous prime is 21230131222073. The next prime is 21230131222121. The reversal of 21230131222111 is 11122213103212.

It is a happy number.

It is not a de Polignac number, because 21230131222111 - 2¹³ = 21230131213919 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 (21230131222121) 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, 20719120 + ... + 21719626.

It is an arithmetic number, because the mean of its divisors is an integer number (1518599056624).

Almost surely, 2^{21230131222111} is an apocalyptic number.

21230131222111 is a deficient number, since it is larger than the sum of its proper divisors (3067453683873).

21230131222111 is a wasteful number, since it uses less digits than its factorization.

21230131222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004830.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21230131222111 its reverse (11122213103212), we get a palindrome (32352344325323).

The spelling of 21230131222111 in words is "twenty-one trillion, two hundred thirty billion, one hundred thirty-one million, two hundred twenty-two thousand, one hundred eleven".