821105726 has 16 divisors (see below), whose sum is σ = 1440345984. Its totient is φ = 343718424.

The previous prime is 821105717. The next prime is 821105737. The reversal of 821105726 is 627501128.

It is a super-2 number, since 2×821105726² = 1348429226539974152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 821105692 and 821105701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681380 + ... + 682583.

It is an arithmetic number, because the mean of its divisors is an integer number (90021624).

Almost surely, 2^821105726 is an apocalyptic number.

821105726 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

821105726 is a deficient number, since it is larger than the sum of its proper divisors (619240258).

821105726 is a wasteful number, since it uses less digits than its factorization.

821105726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364015.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 821105726 is about 28654.9424358172. The cubic root of 821105726 is about 936.4106841903.

The spelling of 821105726 in words is "eight hundred twenty-one million, one hundred five thousand, seven hundred twenty-six".