221450357220061 has 4 divisors (see below), whose sum is σ = 221537234569500. Its totient is φ = 221363479870624.

The previous prime is 221450357220023. The next prime is 221450357220067. The reversal of 221450357220061 is 160022753054122.

221450357220061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204813135954436 + 16637221265625 = 14311294^2 + 4078875^2 .

It is a cyclic number.

It is not a de Polignac number, because 221450357220061 - 2¹³ = 221450357211869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221450357219996 and 221450357220023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221450357220067) 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, 43438670896 + ... + 43438675993.

It is an arithmetic number, because the mean of its divisors is an integer number (55384308642375).

Almost surely, 2^{221450357220061} is an apocalyptic number.

It is an amenable number.

221450357220061 is a deficient number, since it is larger than the sum of its proper divisors (86877349439).

221450357220061 is an equidigital number, since it uses as much as digits as its factorization.

221450357220061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86877349438.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 221450357220061 in words is "two hundred twenty-one trillion, four hundred fifty billion, three hundred fifty-seven million, two hundred twenty thousand, sixty-one".