101616572221 has 4 divisors (see below), whose sum is σ = 104095025244. Its totient is φ = 99138119200.

The previous prime is 101616572209. The next prime is 101616572249. The reversal of 101616572221 is 122275616101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122275616101 = 397 ⋅307999033.

It can be written as a sum of positive squares in 2 ways, for example, as 44787256900 + 56829315321 = 211630^2 + 238389^2 .

It is a cyclic number.

It is not a de Polignac number, because 101616572221 - 2¹⁷ = 101616441149 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 (101616572201) 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, 1239226450 + ... + 1239226531.

It is an arithmetic number, because the mean of its divisors is an integer number (26023756311).

Almost surely, 2^101616572221 is an apocalyptic number.

It is an amenable number.

101616572221 is a deficient number, since it is larger than the sum of its proper divisors (2478453023).

101616572221 is an equidigital number, since it uses as much as digits as its factorization.

101616572221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478453022.

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 101616572221 in words is "one hundred one billion, six hundred sixteen million, five hundred seventy-two thousand, two hundred twenty-one".