21501445045105 has 48 divisors (see below), whose sum is σ = 27404448401232. Its totient is φ = 16184802201600.

The previous prime is 21501445045103. The next prime is 21501445045111. The reversal of 21501445045105 is 50154054410512.

It can be written as a sum of positive squares in 8 ways, for example, as 4113871079824 + 17387573965281 = 2028268^2 + 4169841^2 .

It is not a de Polignac number, because 21501445045105 - 2¹ = 21501445045103 is a prime.

It is a super-2 number, since 2×21501445045105² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21501445045103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57536217 + ... + 57908713.

It is an arithmetic number, because the mean of its divisors is an integer number (570926008359).

Almost surely, 2^{21501445045105} is an apocalyptic number.

It is an amenable number.

21501445045105 is a deficient number, since it is larger than the sum of its proper divisors (5903003356127).

21501445045105 is a wasteful number, since it uses less digits than its factorization.

21501445045105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372898 (or 372867 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 37.

Adding to 21501445045105 its reverse (50154054410512), we get a palindrome (71655499455617).

The spelling of 21501445045105 in words is "twenty-one trillion, five hundred one billion, four hundred forty-five million, forty-five thousand, one hundred five".