1057189821 has 8 divisors (see below), whose sum is σ = 1410720000. Its totient is φ = 704226432.

The previous prime is 1057189817. The next prime is 1057189877. The reversal of 1057189821 is 1289817501.

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

It is not a de Polignac number, because 1057189821 - 2² = 1057189817 is a prime.

It is a super-2 number, since 2×1057189821² = 2235300635252024082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057189891) 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, 137325 + ... + 144818.

It is an arithmetic number, because the mean of its divisors is an integer number (176340000).

Almost surely, 2^1057189821 is an apocalyptic number.

It is an amenable number.

1057189821 is a deficient number, since it is larger than the sum of its proper divisors (353530179).

1057189821 is a wasteful number, since it uses less digits than its factorization.

1057189821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283395.

The product of its (nonzero) digits is 40320, while the sum is 42.

The square root of 1057189821 is about 32514.4555697923. The cubic root of 1057189821 is about 1018.7109889788.

The spelling of 1057189821 in words is "one billion, fifty-seven million, one hundred eighty-nine thousand, eight hundred twenty-one".