1921425501979 has 2 divisors, whose sum is σ = 1921425501980. Its totient is φ = 1921425501978.

The previous prime is 1921425501949. The next prime is 1921425502021. The reversal of 1921425501979 is 9791055241291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921425501979 - 2⁷ = 1921425501851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1921425501949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960712750989 + 960712750990.

It is an arithmetic number, because the mean of its divisors is an integer number (960712750990).

Almost surely, 2^{1921425501979} is an apocalyptic number.

1921425501979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921425501979 is an equidigital number, since it uses as much as digits as its factorization.

1921425501979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The spelling of 1921425501979 in words is "one trillion, nine hundred twenty-one billion, four hundred twenty-five million, five hundred one thousand, nine hundred seventy-nine".