10215542521 has 4 divisors (see below), whose sum is σ = 10254385152. Its totient is φ = 10176699892.

The previous prime is 10215542479. The next prime is 10215542537. The reversal of 10215542521 is 12524551201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12524551201 = 3911 ⋅3202391.

It is a cyclic number.

It is not a de Polignac number, because 10215542521 - 2⁹ = 10215542009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10215542521.

It is not an unprimeable number, because it can be changed into a prime (10215542591) 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, 19420921 + ... + 19421446.

It is an arithmetic number, because the mean of its divisors is an integer number (2563596288).

Almost surely, 2^10215542521 is an apocalyptic number.

It is an amenable number.

10215542521 is a deficient number, since it is larger than the sum of its proper divisors (38842631).

10215542521 is an equidigital number, since it uses as much as digits as its factorization.

10215542521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38842630.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 10215542521 in words is "ten billion, two hundred fifteen million, five hundred forty-two thousand, five hundred twenty-one".