1425919178921 has 2 divisors, whose sum is σ = 1425919178922. Its totient is φ = 1425919178920.

The previous prime is 1425919178909. The next prime is 1425919178927. The reversal of 1425919178921 is 1298719195241.

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., 1425874810000 + 44368921 = 1194100^2 + 6661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1425919178921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1425919178927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 712959589460 + 712959589461.

It is an arithmetic number, because the mean of its divisors is an integer number (712959589461).

Almost surely, 2^{1425919178921} is an apocalyptic number.

It is an amenable number.

1425919178921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1425919178921 is an equidigital number, since it uses as much as digits as its factorization.

1425919178921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 59.

The spelling of 1425919178921 in words is "one trillion, four hundred twenty-five billion, nine hundred nineteen million, one hundred seventy-eight thousand, nine hundred twenty-one".