221086749 has 16 divisors (see below), whose sum is σ = 328406400. Its totient is φ = 131361216.

The previous prime is 221086709. The next prime is 221086757. The reversal of 221086749 is 947680122.

It is not a de Polignac number, because 221086749 - 2⁸ = 221086493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221086709) 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 in 15 ways as a sum of consecutive naturals, for example, 96609 + ... + 98870.

It is an arithmetic number, because the mean of its divisors is an integer number (20525400).

Almost surely, 2^221086749 is an apocalyptic number.

221086749 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

221086749 is a deficient number, since it is larger than the sum of its proper divisors (107319651).

221086749 is a wasteful number, since it uses less digits than its factorization.

221086749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195524.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 221086749 is about 14868.9861456657. The cubic root of 221086749 is about 604.6734562757.

The spelling of 221086749 in words is "two hundred twenty-one million, eighty-six thousand, seven hundred forty-nine".