1165427021 has 8 divisors (see below), whose sum is σ = 1292217888. Its totient is φ = 1042110000.

The previous prime is 1165426961. The next prime is 1165427033. The reversal of 1165427021 is 1207245611.

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 1165427021 - 2⁶ = 1165426957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165427041) 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, 867755 + ... + 869096.

It is an arithmetic number, because the mean of its divisors is an integer number (161527236).

Almost surely, 2^1165427021 is an apocalyptic number.

1165427021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1165427021 is a deficient number, since it is larger than the sum of its proper divisors (126790867).

1165427021 is a wasteful number, since it uses less digits than its factorization.

1165427021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736923.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1165427021 is about 34138.3511757671. The cubic root of 1165427021 is about 1052.3536080511.

The spelling of 1165427021 in words is "one billion, one hundred sixty-five million, four hundred twenty-seven thousand, twenty-one".