21350121231513 has 8 divisors (see below), whose sum is σ = 28467206389728. Its totient is φ = 14233225113824.

The previous prime is 21350121231511. The next prime is 21350121231539. The reversal of 21350121231513 is 31513212105312.

It is a happy number.

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 21350121231513 - 2¹ = 21350121231511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21350121231511) 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 7 ways as a sum of consecutive naturals, for example, 46996395 + ... + 47448512.

It is an arithmetic number, because the mean of its divisors is an integer number (3558400798716).

Almost surely, 2^{21350121231513} is an apocalyptic number.

It is an amenable number.

21350121231513 is a deficient number, since it is larger than the sum of its proper divisors (7117085158215).

21350121231513 is an equidigital number, since it uses as much as digits as its factorization.

21350121231513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94520263.

The product of its (nonzero) digits is 5400, while the sum is 30.

Adding to 21350121231513 its reverse (31513212105312), we get a palindrome (52863333336825).

The spelling of 21350121231513 in words is "twenty-one trillion, three hundred fifty billion, one hundred twenty-one million, two hundred thirty-one thousand, five hundred thirteen".