3420021661361 has 4 divisors (see below), whose sum is σ = 3420027072000. Its totient is φ = 3420016250724.

The previous prime is 3420021661321. The next prime is 3420021661363. The reversal of 3420021661361 is 1631661200243.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3420021661361 - 2¹⁰ = 3420021660337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3420021661363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1609121 + ... + 3070718.

It is an arithmetic number, because the mean of its divisors is an integer number (855006768000).

Almost surely, 2^{3420021661361} is an apocalyptic number.

It is an amenable number.

3420021661361 is a deficient number, since it is larger than the sum of its proper divisors (5410639).

3420021661361 is an equidigital number, since it uses as much as digits as its factorization.

3420021661361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5410638.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 3420021661361 in words is "three trillion, four hundred twenty billion, twenty-one million, six hundred sixty-one thousand, three hundred sixty-one".