201447557221 has 2 divisors, whose sum is σ = 201447557222. Its totient is φ = 201447557220.

The previous prime is 201447557153. The next prime is 201447557291. The reversal of 201447557221 is 122755744102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149857248996 + 51590308225 = 387114^2 + 227135^2 .

It is a cyclic number.

It is not a de Polignac number, because 201447557221 - 2¹¹ = 201447555173 is a prime.

It is a super-2 number, since 2×201447557221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201447557291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100723778610 + 100723778611.

It is an arithmetic number, because the mean of its divisors is an integer number (100723778611).

Almost surely, 2^201447557221 is an apocalyptic number.

It is an amenable number.

201447557221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201447557221 is an equidigital number, since it uses as much as digits as its factorization.

201447557221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156800, while the sum is 40.

The spelling of 201447557221 in words is "two hundred one billion, four hundred forty-seven million, five hundred fifty-seven thousand, two hundred twenty-one".