11521220501 has 12 divisors (see below), whose sum is σ = 14190603948. Its totient is φ = 9294429312.

The previous prime is 11521220483. The next prime is 11521220537. The reversal of 11521220501 is 10502212511.

It can be written as a sum of positive squares in 2 ways, for example, as 10834728100 + 686492401 = 104090^2 + 26201^2 .

It is not a de Polignac number, because 11521220501 - 2¹⁴ = 11521204117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521220561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6914666 + ... + 6916331.

It is an arithmetic number, because the mean of its divisors is an integer number (1182550329).

Almost surely, 2^11521220501 is an apocalyptic number.

It is an amenable number.

11521220501 is a deficient number, since it is larger than the sum of its proper divisors (2669383447).

11521220501 is a wasteful number, since it uses less digits than its factorization.

11521220501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13831028 (or 13831021 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The spelling of 11521220501 in words is "eleven billion, five hundred twenty-one million, two hundred twenty thousand, five hundred one".