221049739 has 2 divisors, whose sum is σ = 221049740. Its totient is φ = 221049738.

The previous prime is 221049727. The next prime is 221049749. The reversal of 221049739 is 937940122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221049739 - 2¹³ = 221041547 is a prime.

It is a super-2 number, since 2×221049739² = 97725974223936242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221049698 and 221049707.

It is not a weakly prime, because it can be changed into another prime (221049709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110524869 + 110524870.

It is an arithmetic number, because the mean of its divisors is an integer number (110524870).

Almost surely, 2^221049739 is an apocalyptic number.

221049739 is a deficient number, since it is larger than the sum of its proper divisors (1).

221049739 is an equidigital number, since it uses as much as digits as its factorization.

221049739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 221049739 is about 14867.7415568068. The cubic root of 221049739 is about 604.6397135426.

The spelling of 221049739 in words is "two hundred twenty-one million, forty-nine thousand, seven hundred thirty-nine".