10011020621605 has 8 divisors (see below), whose sum is σ = 12013241823864. Its totient is φ = 8008805112000.

The previous prime is 10011020621603. The next prime is 10011020621627. The reversal of 10011020621605 is 50612602011001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5074598719969 + 4936421901636 = 2252687^2 + 2221806^2 .

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

It is not a de Polignac number, because 10011020621605 - 2¹ = 10011020621603 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 10011020621605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011020621603) 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, 5566795 + ... + 7142215.

It is an arithmetic number, because the mean of its divisors is an integer number (1501655227983).

Almost surely, 2^{10011020621605} is an apocalyptic number.

It is an amenable number.

10011020621605 is a deficient number, since it is larger than the sum of its proper divisors (2002221202259).

10011020621605 is a wasteful number, since it uses less digits than its factorization.

10011020621605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2846327.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 10011020621605 its reverse (50612602011001), we get a palindrome (60623622632606).

The spelling of 10011020621605 in words is "ten trillion, eleven billion, twenty million, six hundred twenty-one thousand, six hundred five".