537521339221 has 2 divisors, whose sum is σ = 537521339222. Its totient is φ = 537521339220.

The previous prime is 537521339191. The next prime is 537521339261. The reversal of 537521339221 is 122933125735.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306516142321 + 231005196900 = 553639^2 + 480630^2 .

It is a cyclic number.

It is not a de Polignac number, because 537521339221 - 2⁷ = 537521339093 is a prime.

It is a super-3 number, since 3×537521339221³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (537521339261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268760669610 + 268760669611.

It is an arithmetic number, because the mean of its divisors is an integer number (268760669611).

Almost surely, 2^537521339221 is an apocalyptic number.

It is an amenable number.

537521339221 is a deficient number, since it is larger than the sum of its proper divisors (1).

537521339221 is an equidigital number, since it uses as much as digits as its factorization.

537521339221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 43.

The spelling of 537521339221 in words is "five hundred thirty-seven billion, five hundred twenty-one million, three hundred thirty-nine thousand, two hundred twenty-one".