1421126129 has 2 divisors, whose sum is σ = 1421126130. Its totient is φ = 1421126128.

The previous prime is 1421126111. The next prime is 1421126137. The reversal of 1421126129 is 9216211241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1379973904 + 41152225 = 37148^2 + 6415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421126129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1421126429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710563064 + 710563065.

It is an arithmetic number, because the mean of its divisors is an integer number (710563065).

Almost surely, 2^1421126129 is an apocalyptic number.

It is an amenable number.

1421126129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421126129 is an equidigital number, since it uses as much as digits as its factorization.

1421126129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 1421126129 is about 37697.8265819132. The cubic root of 1421126129 is about 1124.2879125609.

The spelling of 1421126129 in words is "one billion, four hundred twenty-one million, one hundred twenty-six thousand, one hundred twenty-nine".