21000526537 has 2 divisors, whose sum is σ = 21000526538. Its totient is φ = 21000526536.

The previous prime is 21000526517. The next prime is 21000526541. The reversal of 21000526537 is 73562500012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20313090576 + 687435961 = 142524^2 + 26219^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000526537 - 2⁷ = 21000526409 is a prime.

It is a super-2 number, since 2×21000526537² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000526499 and 21000526508.

It is not a weakly prime, because it can be changed into another prime (21000526517) 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 as a sum of consecutive naturals, namely, 10500263268 + 10500263269.

It is an arithmetic number, because the mean of its divisors is an integer number (10500263269).

Almost surely, 2^21000526537 is an apocalyptic number.

It is an amenable number.

21000526537 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000526537 is an equidigital number, since it uses as much as digits as its factorization.

21000526537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 31.

The spelling of 21000526537 in words is "twenty-one billion, five hundred twenty-six thousand, five hundred thirty-seven".