21153131401 has 2 divisors, whose sum is σ = 21153131402. Its totient is φ = 21153131400.

The previous prime is 21153131383. The next prime is 21153131407. The reversal of 21153131401 is 10413135112.

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., 20923911801 + 229219600 = 144651^2 + 15140^2 .

It is a cyclic number.

It is not a de Polignac number, because 21153131401 - 2⁷ = 21153131273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21153131407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576565700 + 10576565701.

It is an arithmetic number, because the mean of its divisors is an integer number (10576565701).

Almost surely, 2^21153131401 is an apocalyptic number.

It is an amenable number.

21153131401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153131401 is an equidigital number, since it uses as much as digits as its factorization.

21153131401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 21153131401 its reverse (10413135112), we get a palindrome (31566266513).

The spelling of 21153131401 in words is "twenty-one billion, one hundred fifty-three million, one hundred thirty-one thousand, four hundred one".