21224032514205 has 32 divisors (see below), whose sum is σ = 35157336681600. Its totient is φ = 10920475867392.

The previous prime is 21224032514203. The next prime is 21224032514327. The reversal of 21224032514205 is 50241523042212.

It is not a de Polignac number, because 21224032514205 - 2¹ = 21224032514203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224032514203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18829174 + ... + 19924503.

It is an arithmetic number, because the mean of its divisors is an integer number (1098666771300).

Almost surely, 2^{21224032514205} is an apocalyptic number.

It is an amenable number.

21224032514205 is a deficient number, since it is larger than the sum of its proper divisors (13933304167395).

21224032514205 is a wasteful number, since it uses less digits than its factorization.

21224032514205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38754973.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 21224032514205 its reverse (50241523042212), we get a palindrome (71465555556417).

The spelling of 21224032514205 in words is "twenty-one trillion, two hundred twenty-four billion, thirty-two million, five hundred fourteen thousand, two hundred five".