221520500253 has 12 divisors (see below), whose sum is σ = 344587445020. Its totient is φ = 136320307776.

The previous prime is 221520500219. The next prime is 221520500269. The reversal of 221520500253 is 352005025122.

221520500253 is a `hidden beast` number, since 2 + 2 + 152 + 0 + 500 + 2 + 5 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 88121703609 + 133398796644 = 296853^2 + 365238^2 .

It is not a de Polignac number, because 221520500253 - 2⁹ = 221520499741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221520500213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 946668688 + ... + 946668921.

Almost surely, 2^221520500253 is an apocalyptic number.

It is an amenable number.

221520500253 is a deficient number, since it is larger than the sum of its proper divisors (123066944767).

221520500253 is a wasteful number, since it uses less digits than its factorization.

221520500253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893337628 (or 1893337625 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 221520500253 its reverse (352005025122), we get a palindrome (573525525375).

The spelling of 221520500253 in words is "two hundred twenty-one billion, five hundred twenty million, five hundred thousand, two hundred fifty-three".