3421766867921 has 2 divisors, whose sum is σ = 3421766867922. Its totient is φ = 3421766867920.

The previous prime is 3421766867879. The next prime is 3421766867923. The reversal of 3421766867921 is 1297686671243.

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., 1977229699600 + 1444537168321 = 1406140^2 + 1201889^2 .

It is a cyclic number.

It is not a de Polignac number, because 3421766867921 - 2³⁴ = 3404586998737 is a prime.

Together with 3421766867923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3421766867923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1710883433960 + 1710883433961.

It is an arithmetic number, because the mean of its divisors is an integer number (1710883433961).

Almost surely, 2^{3421766867921} is an apocalyptic number.

It is an amenable number.

3421766867921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3421766867921 is an equidigital number, since it uses as much as digits as its factorization.

3421766867921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 62.

The spelling of 3421766867921 in words is "three trillion, four hundred twenty-one billion, seven hundred sixty-six million, eight hundred sixty-seven thousand, nine hundred twenty-one".