1021812145 has 8 divisors (see below), whose sum is σ = 1279486656. Its totient is φ = 781908336.

The previous prime is 1021812137. The next prime is 1021812157. The reversal of 1021812145 is 5412181201.

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 1021812145 - 2³ = 1021812137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4442547 + ... + 4442776.

It is an arithmetic number, because the mean of its divisors is an integer number (159935832).

Almost surely, 2^1021812145 is an apocalyptic number.

It is an amenable number.

1021812145 is a deficient number, since it is larger than the sum of its proper divisors (257674511).

1021812145 is an equidigital number, since it uses as much as digits as its factorization.

1021812145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8885351.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1021812145 is about 31965.7964862445. The cubic root of 1021812145 is about 1007.2184831248.

Adding to 1021812145 its reverse (5412181201), we get a palindrome (6433993346).

The spelling of 1021812145 in words is "one billion, twenty-one million, eight hundred twelve thousand, one hundred forty-five".