11521498430821 has 8 divisors (see below), whose sum is σ = 12199359366144. Its totient is φ = 10843651465920.

The previous prime is 11521498430779. The next prime is 11521498430837. The reversal of 11521498430821 is 12803489412511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11521498430821 - 2¹¹ = 11521498428773 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 (11521498434821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1770405 + ... + 5116378.

It is an arithmetic number, because the mean of its divisors is an integer number (1524919920768).

Almost surely, 2^{11521498430821} is an apocalyptic number.

It is an amenable number.

11521498430821 is a deficient number, since it is larger than the sum of its proper divisors (677860935323).

11521498430821 is an equidigital number, since it uses as much as digits as its factorization.

11521498430821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985211.

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 11521498430821 in words is "eleven trillion, five hundred twenty-one billion, four hundred ninety-eight million, four hundred thirty thousand, eight hundred twenty-one".