21530530140045 has 32 divisors (see below), whose sum is σ = 34478513053824. Its totient is φ = 11473063430400.

The previous prime is 21530530140011. The next prime is 21530530140089. The reversal of 21530530140045 is 54004103503512.

It is not a de Polignac number, because 21530530140045 - 2¹³ = 21530530131853 is a prime.

It is a super-2 number, since 2×21530530140045² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21530530139988 and 21530530140015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159914655 + ... + 160049235.

It is an arithmetic number, because the mean of its divisors is an integer number (1077453532932).

Almost surely, 2^{21530530140045} is an apocalyptic number.

It is an amenable number.

21530530140045 is a deficient number, since it is larger than the sum of its proper divisors (12947982913779).

21530530140045 is a wasteful number, since it uses less digits than its factorization.

21530530140045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143693.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 21530530140045 its reverse (54004103503512), we get a palindrome (75534633643557).

The spelling of 21530530140045 in words is "twenty-one trillion, five hundred thirty billion, five hundred thirty million, one hundred forty thousand, forty-five".