20111202401 has 2 divisors, whose sum is σ = 20111202402. Its totient is φ = 20111202400.

The previous prime is 20111202359. The next prime is 20111202413. The reversal of 20111202401 is 10420211102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15413470801 + 4697731600 = 124151^2 + 68540^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111202401 - 2⁶ = 20111202337 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111204401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055601200 + 10055601201.

It is an arithmetic number, because the mean of its divisors is an integer number (10055601201).

Almost surely, 2^20111202401 is an apocalyptic number.

It is an amenable number.

20111202401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111202401 is an equidigital number, since it uses as much as digits as its factorization.

20111202401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20111202401 its reverse (10420211102), we get a palindrome (30531413503).

The spelling of 20111202401 in words is "twenty billion, one hundred eleven million, two hundred two thousand, four hundred one".