21632230004137 has 4 divisors (see below), whose sum is σ = 21632452707796. Its totient is φ = 21632007300480.

The previous prime is 21632230004117. The next prime is 21632230004173. The reversal of 21632230004137 is 73140003223612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20566760133481 + 1065469870656 = 4535059^2 + 1032216^2 .

It is a cyclic number.

It is not a de Polignac number, because 21632230004137 - 2³¹ = 21630082520489 is a prime.

It is a super-2 number, since 2×21632230004137² (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 (21632230004117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111206064 + ... + 111400417.

It is an arithmetic number, because the mean of its divisors is an integer number (5408113176949).

Almost surely, 2^{21632230004137} is an apocalyptic number.

It is an amenable number.

21632230004137 is a deficient number, since it is larger than the sum of its proper divisors (222703659).

21632230004137 is an equidigital number, since it uses as much as digits as its factorization.

21632230004137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222703658.

The product of its (nonzero) digits is 36288, while the sum is 34.

Adding to 21632230004137 its reverse (73140003223612), we get a palindrome (94772233227749).

The spelling of 21632230004137 in words is "twenty-one trillion, six hundred thirty-two billion, two hundred thirty million, four thousand, one hundred thirty-seven".