221053531 has 2 divisors, whose sum is σ = 221053532. Its totient is φ = 221053530.

The previous prime is 221053523. The next prime is 221053537. The reversal of 221053531 is 135350122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221053531 - 2³ = 221053523 is a prime.

It is a super-2 number, since 2×221053531² = 97729327135135922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221053537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110526765 + 110526766.

It is an arithmetic number, because the mean of its divisors is an integer number (110526766).

Almost surely, 2^221053531 is an apocalyptic number.

221053531 is a deficient number, since it is larger than the sum of its proper divisors (1).

221053531 is an equidigital number, since it uses as much as digits as its factorization.

221053531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 221053531 is about 14867.8690806719. The cubic root of 221053531 is about 604.6431709555.

The spelling of 221053531 in words is "two hundred twenty-one million, fifty-three thousand, five hundred thirty-one".