11420525521 has 4 divisors (see below), whose sum is σ = 11421801652. Its totient is φ = 11419249392.

The previous prime is 11420525503. The next prime is 11420525539. The reversal of 11420525521 is 12552502411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12552502411 = 13669 ⋅918319.

It is an interprime number because it is at equal distance from previous prime (11420525503) and next prime (11420525539).

It can be written as a sum of positive squares in 2 ways, for example, as 5014764225 + 6405761296 = 70815^2 + 80036^2 .

It is a cyclic number.

It is not a de Polignac number, because 11420525521 - 2¹⁹ = 11420001233 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 11420525521.

It is not an unprimeable number, because it can be changed into a prime (11420525551) 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, 624546 + ... + 642571.

It is an arithmetic number, because the mean of its divisors is an integer number (2855450413).

Almost surely, 2^11420525521 is an apocalyptic number.

It is an amenable number.

11420525521 is a deficient number, since it is larger than the sum of its proper divisors (1276131).

11420525521 is an equidigital number, since it uses as much as digits as its factorization.

11420525521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276130.

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

The spelling of 11420525521 in words is "eleven billion, four hundred twenty million, five hundred twenty-five thousand, five hundred twenty-one".