1055727721 has 8 divisors (see below), whose sum is σ = 1060829280. Its totient is φ = 1050638688.

The previous prime is 1055727707. The next prime is 1055727763. The reversal of 1055727721 is 1277275501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1055727721 - 2⁵ = 1055727689 is a prime.

It is a super-2 number, since 2×1055727721² = 2229122041775707682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1055727781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194770 + ... + 200116.

It is an arithmetic number, because the mean of its divisors is an integer number (132603660).

Almost surely, 2^1055727721 is an apocalyptic number.

It is an amenable number.

1055727721 is a deficient number, since it is larger than the sum of its proper divisors (5101559).

1055727721 is an equidigital number, since it uses as much as digits as its factorization.

1055727721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6263.

The product of its (nonzero) digits is 34300, while the sum is 37.

The square root of 1055727721 is about 32491.9639449511. The cubic root of 1055727721 is about 1018.2411444664.

The spelling of 1055727721 in words is "one billion, fifty-five million, seven hundred twenty-seven thousand, seven hundred twenty-one".