161616211346021 has 8 divisors (see below), whose sum is σ = 161643747775104. Its totient is φ = 161588676087520.

The previous prime is 161616211345999. The next prime is 161616211346053. The reversal of 161616211346021 is 120643112616161.

161616211346021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161616211346021 - 2¹⁴ = 161616211329637 is a prime.

It is a super-2 number, since 2×161616211346021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161616211346021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161616211346921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302201966 + ... + 302736288.

It is an arithmetic number, because the mean of its divisors is an integer number (20205468471888).

Almost surely, 2^{161616211346021} is an apocalyptic number.

It is an amenable number.

161616211346021 is a deficient number, since it is larger than the sum of its proper divisors (27536429083).

161616211346021 is an equidigital number, since it uses as much as digits as its factorization.

161616211346021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585291.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 161616211346021 in words is "one hundred sixty-one trillion, six hundred sixteen billion, two hundred eleven million, three hundred forty-six thousand, twenty-one".