1055438821 has 8 divisors (see below), whose sum is σ = 1066000320. Its totient is φ = 1044919008.

The previous prime is 1055438773. The next prime is 1055438843. The reversal of 1055438821 is 1288345501.

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 1055438821 - 2¹¹ = 1055436773 is a prime.

It is a super-2 number, since 2×1055438821² = 2227902209747740082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055438621) 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, 41760 + ... + 62086.

It is an arithmetic number, because the mean of its divisors is an integer number (133250040).

Almost surely, 2^1055438821 is an apocalyptic number.

It is an amenable number.

1055438821 is a deficient number, since it is larger than the sum of its proper divisors (10561499).

1055438821 is a wasteful number, since it uses less digits than its factorization.

1055438821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20843.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 1055438821 is about 32487.5179261205. The cubic root of 1055438821 is about 1018.1482553947.

The spelling of 1055438821 in words is "one billion, fifty-five million, four hundred thirty-eight thousand, eight hundred twenty-one".