211111000021231 has 2 divisors, whose sum is σ = 211111000021232. Its totient is φ = 211111000021230.

The previous prime is 211111000021189. The next prime is 211111000021253. The reversal of 211111000021231 is 132120000111112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211111000021231 - 2²³ = 211110991632623 is a prime.

It is a super-2 number, since 2×211111000021231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211111000021531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555500010615 + 105555500010616.

It is an arithmetic number, because the mean of its divisors is an integer number (105555500010616).

Almost surely, 2^{211111000021231} is an apocalyptic number.

211111000021231 is a deficient number, since it is larger than the sum of its proper divisors (1).

211111000021231 is an equidigital number, since it uses as much as digits as its factorization.

211111000021231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 211111000021231 its reverse (132120000111112), we get a palindrome (343231000132343).

The spelling of 211111000021231 in words is "two hundred eleven trillion, one hundred eleven billion, twenty-one thousand, two hundred thirty-one".