10021531532521 has 2 divisors, whose sum is σ = 10021531532522. Its totient is φ = 10021531532520.

The previous prime is 10021531532491. The next prime is 10021531532531. The reversal of 10021531532521 is 12523513512001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8682097971600 + 1339433560921 = 2946540^2 + 1157339^2 .

It is an emirp because it is prime and its reverse (12523513512001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10021531532521 - 2¹⁵ = 10021531499753 is a prime.

It is not a weakly prime, because it can be changed into another prime (10021531532531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010765766260 + 5010765766261.

It is an arithmetic number, because the mean of its divisors is an integer number (5010765766261).

Almost surely, 2^{10021531532521} is an apocalyptic number.

It is an amenable number.

10021531532521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021531532521 is an equidigital number, since it uses as much as digits as its factorization.

10021531532521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 10021531532521 in words is "ten trillion, twenty-one billion, five hundred thirty-one million, five hundred thirty-two thousand, five hundred twenty-one".