20111223401 has 2 divisors, whose sum is σ = 20111223402. Its totient is φ = 20111223400.

The previous prime is 20111223383. The next prime is 20111223409. The reversal of 20111223401 is 10432211102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16925749801 + 3185473600 = 130099^2 + 56440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111223401 - 2²² = 20107029097 is a prime.

It is a super-2 number, since 2×20111223401² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20111223401.

It is not a weakly prime, because it can be changed into another prime (20111223409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055611700 + 10055611701.

It is an arithmetic number, because the mean of its divisors is an integer number (10055611701).

Almost surely, 2^20111223401 is an apocalyptic number.

It is an amenable number.

20111223401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111223401 is an equidigital number, since it uses as much as digits as its factorization.

20111223401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20111223401 its reverse (10432211102), we get a palindrome (30543434503).

The spelling of 20111223401 in words is "twenty billion, one hundred eleven million, two hundred twenty-three thousand, four hundred one".