21126532337 has 2 divisors, whose sum is σ = 21126532338. Its totient is φ = 21126532336.

The previous prime is 21126532279. The next prime is 21126532403. The reversal of 21126532337 is 73323562112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15366329521 + 5760202816 = 123961^2 + 75896^2 .

It is a cyclic number.

It is not a de Polignac number, because 21126532337 - 2⁸ = 21126532081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21126532297 and 21126532306.

It is not a weakly prime, because it can be changed into another prime (21126532237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563266168 + 10563266169.

It is an arithmetic number, because the mean of its divisors is an integer number (10563266169).

Almost surely, 2^21126532337 is an apocalyptic number.

It is an amenable number.

21126532337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126532337 is an equidigital number, since it uses as much as digits as its factorization.

21126532337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 35.

The spelling of 21126532337 in words is "twenty-one billion, one hundred twenty-six million, five hundred thirty-two thousand, three hundred thirty-seven".