21275202237 has 8 divisors (see below), whose sum is σ = 28393982400. Its totient is φ = 14169945120.

The previous prime is 21275202217. The next prime is 21275202259. The reversal of 21275202237 is 73220257212.

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

It is not a de Polignac number, because 21275202237 - 2²⁴ = 21258425021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21275202198 and 21275202207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275202217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3377089 + ... + 3383382.

It is an arithmetic number, because the mean of its divisors is an integer number (3549247800).

Almost surely, 2^21275202237 is an apocalyptic number.

It is an amenable number.

21275202237 is a deficient number, since it is larger than the sum of its proper divisors (7118780163).

21275202237 is a wasteful number, since it uses less digits than its factorization.

21275202237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6761523.

The product of its (nonzero) digits is 23520, while the sum is 33.

Adding to 21275202237 its reverse (73220257212), we get a palindrome (94495459449).

The spelling of 21275202237 in words is "twenty-one billion, two hundred seventy-five million, two hundred two thousand, two hundred thirty-seven".