1867770120421 has 6 divisors (see below), whose sum is σ = 1984101823730. Its totient is φ = 1757901289536.

The previous prime is 1867770120413. The next prime is 1867770120451. The reversal of 1867770120421 is 1240210777681.

It can be written as a sum of positive squares in 3 ways, for example, as 1325837102500 + 541933017921 = 1151450^2 + 736161^2 .

It is not a de Polignac number, because 1867770120421 - 2³ = 1867770120413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1867770120401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3231435906 + ... + 3231436483.

Almost surely, 2^{1867770120421} is an apocalyptic number.

It is an amenable number.

1867770120421 is a deficient number, since it is larger than the sum of its proper divisors (116331703309).

1867770120421 is an equidigital number, since it uses as much as digits as its factorization.

1867770120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6462872423 (or 6462872406 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 46.

The spelling of 1867770120421 in words is "one trillion, eight hundred sixty-seven billion, seven hundred seventy million, one hundred twenty thousand, four hundred twenty-one".