221053537 has 2 divisors, whose sum is σ = 221053538. Its totient is φ = 221053536.

The previous prime is 221053531. The next prime is 221053541. The reversal of 221053537 is 735350122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181602576 + 39450961 = 13476^2 + 6281^2 .

It is a cyclic number.

It is not a de Polignac number, because 221053537 - 2⁷ = 221053409 is a prime.

It is not a weakly prime, because it can be changed into another prime (221053531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110526768 + 110526769.

It is an arithmetic number, because the mean of its divisors is an integer number (110526769).

Almost surely, 2^221053537 is an apocalyptic number.

It is an amenable number.

221053537 is a deficient number, since it is larger than the sum of its proper divisors (1).

221053537 is an equidigital number, since it uses as much as digits as its factorization.

221053537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 221053537 is about 14867.8692824493. The cubic root of 221053537 is about 604.6431764261.

The spelling of 221053537 in words is "two hundred twenty-one million, fifty-three thousand, five hundred thirty-seven".