10021231645 has 8 divisors (see below), whose sum is σ = 12135804120. Its totient is φ = 7943434560.

The previous prime is 10021231643. The next prime is 10021231651. The reversal of 10021231645 is 54613212001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1596561849 + 8424669796 = 39957^2 + 91786^2 .

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

It is not a de Polignac number, because 10021231645 - 2¹ = 10021231643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021231643) 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, 9193246 + ... + 9194335.

It is an arithmetic number, because the mean of its divisors is an integer number (1516975515).

Almost surely, 2^10021231645 is an apocalyptic number.

It is an amenable number.

10021231645 is a deficient number, since it is larger than the sum of its proper divisors (2114572475).

10021231645 is a wasteful number, since it uses less digits than its factorization.

10021231645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18387695.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 10021231645 its reverse (54613212001), we get a palindrome (64634443646).

The spelling of 10021231645 in words is "ten billion, twenty-one million, two hundred thirty-one thousand, six hundred forty-five".