1425206021 has 2 divisors, whose sum is σ = 1425206022. Its totient is φ = 1425206020.

The previous prime is 1425205993. The next prime is 1425206087. The reversal of 1425206021 is 1206025241.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1420536100 + 4669921 = 37690^2 + 2161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1425206021 - 2¹⁰ = 1425204997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1425206621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 712603010 + 712603011.

It is an arithmetic number, because the mean of its divisors is an integer number (712603011).

Almost surely, 2^1425206021 is an apocalyptic number.

It is an amenable number.

1425206021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1425206021 is an equidigital number, since it uses as much as digits as its factorization.

1425206021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1425206021 is about 37751.9008925378. The cubic root of 1425206021 is about 1125.3627856479.

The spelling of 1425206021 in words is "one billion, four hundred twenty-five million, two hundred six thousand, twenty-one".