1063840921 has 16 divisors (see below), whose sum is σ = 1250964288. Its totient is φ = 891921600.

The previous prime is 1063840907. The next prime is 1063840933. The reversal of 1063840921 is 1290483601.

It is a cyclic number.

It is not a de Polignac number, because 1063840921 - 2⁵ = 1063840889 is a prime.

It is a super-2 number, since 2×1063840921² = 2263515010388256482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1063840961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194790 + ... + 200176.

It is an arithmetic number, because the mean of its divisors is an integer number (78185268).

Almost surely, 2^1063840921 is an apocalyptic number.

1063840921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1063840921 is a deficient number, since it is larger than the sum of its proper divisors (187123367).

1063840921 is a wasteful number, since it uses less digits than its factorization.

1063840921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6792.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1063840921 is about 32616.5743296257. The cubic root of 1063840921 is about 1020.8428638081.

The spelling of 1063840921 in words is "one billion, sixty-three million, eight hundred forty thousand, nine hundred twenty-one".