21162401147 has 2 divisors, whose sum is σ = 21162401148. Its totient is φ = 21162401146.

The previous prime is 21162401129. The next prime is 21162401173. The reversal of 21162401147 is 74110426112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21162401147 - 2¹⁰ = 21162400123 is a prime.

It is not a weakly prime, because it can be changed into another prime (21162401047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581200573 + 10581200574.

It is an arithmetic number, because the mean of its divisors is an integer number (10581200574).

Almost surely, 2^21162401147 is an apocalyptic number.

21162401147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162401147 is an equidigital number, since it uses as much as digits as its factorization.

21162401147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

Adding to 21162401147 its reverse (74110426112), we get a palindrome (95272827259).

The spelling of 21162401147 in words is "twenty-one billion, one hundred sixty-two million, four hundred one thousand, one hundred forty-seven".