1021535306645 has 16 divisors (see below), whose sum is σ = 1401034734720. Its totient is φ = 700445338944.

The previous prime is 1021535306611. The next prime is 1021535306647. The reversal of 1021535306645 is 5466035351201.

It is a cyclic number.

It is not a de Polignac number, because 1021535306645 - 2¹⁶ = 1021535241109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021535306647) 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, 50627 + ... + 1430256.

It is an arithmetic number, because the mean of its divisors is an integer number (87564670920).

Almost surely, 2^{1021535306645} is an apocalyptic number.

It is an amenable number.

1021535306645 is a deficient number, since it is larger than the sum of its proper divisors (379499428075).

1021535306645 is a wasteful number, since it uses less digits than its factorization.

1021535306645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500604.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 1021535306645 in words is "one trillion, twenty-one billion, five hundred thirty-five million, three hundred six thousand, six hundred forty-five".