1021345653 has 8 divisors (see below), whose sum is σ = 1364592448. Its totient is φ = 679497984.

The previous prime is 1021345649. The next prime is 1021345687. The reversal of 1021345653 is 3565431201.

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

It is not a de Polignac number, because 1021345653 - 2² = 1021345649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021345653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021345603) by changing a digit.

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, 348076 + ... + 350997.

It is an arithmetic number, because the mean of its divisors is an integer number (170574056).

Almost surely, 2^1021345653 is an apocalyptic number.

It is an amenable number.

1021345653 is a deficient number, since it is larger than the sum of its proper divisors (343246795).

1021345653 is an equidigital number, since it uses as much as digits as its factorization.

1021345653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699563.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 1021345653 is about 31958.4989165637. The cubic root of 1021345653 is about 1007.0651832945.

Adding to 1021345653 its reverse (3565431201), we get a palindrome (4586776854).

The spelling of 1021345653 in words is "one billion, twenty-one million, three hundred forty-five thousand, six hundred fifty-three".