1021643057 has 8 divisors (see below), whose sum is σ = 1035331584. Its totient is φ = 1008036288.

The previous prime is 1021643017. The next prime is 1021643071. The reversal of 1021643057 is 7503461201.

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 1021643057 - 2¹⁰ = 1021642033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021643017) 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, 4928 + ... + 45470.

It is an arithmetic number, because the mean of its divisors is an integer number (129416448).

Almost surely, 2^1021643057 is an apocalyptic number.

It is an amenable number.

1021643057 is a deficient number, since it is larger than the sum of its proper divisors (13688527).

1021643057 is a wasteful number, since it uses less digits than its factorization.

1021643057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40879.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1021643057 is about 31963.1515498707. The cubic root of 1021643057 is about 1007.1629223726.

The spelling of 1021643057 in words is "one billion, twenty-one million, six hundred forty-three thousand, fifty-seven".