221221053 has 12 divisors (see below), whose sum is σ = 329849728. Its totient is φ = 142723080.

The previous prime is 221221037. The next prime is 221221067. The reversal of 221221053 is 350122122.

It is not a de Polignac number, because 221221053 - 2⁴ = 221221037 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 (221221073) 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, 396175 + ... + 396732.

Almost surely, 2^221221053 is an apocalyptic number.

It is an amenable number.

221221053 is a deficient number, since it is larger than the sum of its proper divisors (108628675).

221221053 is a wasteful number, since it uses less digits than its factorization.

221221053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792944 (or 792941 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 221221053 is about 14873.5017060543. The cubic root of 221221053 is about 604.7958722135.

Adding to 221221053 its reverse (350122122), we get a palindrome (571343175).

The spelling of 221221053 in words is "two hundred twenty-one million, two hundred twenty-one thousand, fifty-three".