20401212449 has 2 divisors, whose sum is σ = 20401212450. Its totient is φ = 20401212448.

The previous prime is 20401212431. The next prime is 20401212463. The reversal of 20401212449 is 94421210402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11926168849 + 8475043600 = 109207^2 + 92060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20401212449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20401212409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200606224 + 10200606225.

It is an arithmetic number, because the mean of its divisors is an integer number (10200606225).

Almost surely, 2^20401212449 is an apocalyptic number.

It is an amenable number.

20401212449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401212449 is an equidigital number, since it uses as much as digits as its factorization.

20401212449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 20401212449 in words is "twenty billion, four hundred one million, two hundred twelve thousand, four hundred forty-nine".