221050537 has 2 divisors, whose sum is σ = 221050538. Its totient is φ = 221050536.

The previous prime is 221050483. The next prime is 221050547. The reversal of 221050537 is 735050122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212459776 + 8590761 = 14576^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 221050537 - 2⁷ = 221050409 is a prime.

It is not a weakly prime, because it can be changed into another prime (221050547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110525268 + 110525269.

It is an arithmetic number, because the mean of its divisors is an integer number (110525269).

Almost surely, 2^221050537 is an apocalyptic number.

It is an amenable number.

221050537 is a deficient number, since it is larger than the sum of its proper divisors (1).

221050537 is an equidigital number, since it uses as much as digits as its factorization.

221050537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 221050537 is about 14867.7683934073. The cubic root of 221050537 is about 604.6404411344.

The spelling of 221050537 in words is "two hundred twenty-one million, fifty thousand, five hundred thirty-seven".