221126553 has 12 divisors (see below), whose sum is σ = 320778900. Its totient is φ = 146783616.

The previous prime is 221126539. The next prime is 221126557. The reversal of 221126553 is 355621122.

It is a happy number.

221126553 is a `hidden beast` number, since 2 + 2 + 1 + 1 + 2 + 655 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 65076489 + 156050064 = 8067^2 + 12492^2 .

It is not a de Polignac number, because 221126553 - 2¹² = 221122457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221126557) 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, 50628 + ... + 54821.

It is an arithmetic number, because the mean of its divisors is an integer number (26731575).

Almost surely, 2^221126553 is an apocalyptic number.

It is an amenable number.

221126553 is a deficient number, since it is larger than the sum of its proper divisors (99652347).

221126553 is a wasteful number, since it uses less digits than its factorization.

221126553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105688 (or 105685 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 221126553 is about 14870.3245761483. The cubic root of 221126553 is about 604.7097421500.

Adding to 221126553 its reverse (355621122), we get a palindrome (576747675).

The spelling of 221126553 in words is "two hundred twenty-one million, one hundred twenty-six thousand, five hundred fifty-three".