221601655053 has 6 divisors (see below), whose sum is σ = 320091279534. Its totient is φ = 147734436696.

The previous prime is 221601655043. The next prime is 221601655081. The reversal of 221601655053 is 350556106122.

It can be written as a sum of positive squares in only one way, i.e., 202861961604 + 18739693449 = 450402^2 + 136893^2 .

It is not a de Polignac number, because 221601655053 - 2⁸ = 221601654797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221601654999 and 221601655017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221601655013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12311203050 + ... + 12311203067.

It is an arithmetic number, because the mean of its divisors is an integer number (53348546589).

Almost surely, 2^221601655053 is an apocalyptic number.

It is an amenable number.

221601655053 is a deficient number, since it is larger than the sum of its proper divisors (98489624481).

221601655053 is a wasteful number, since it uses less digits than its factorization.

221601655053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24622406123 (or 24622406120 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 221601655053 in words is "two hundred twenty-one billion, six hundred one million, six hundred fifty-five thousand, fifty-three".