13123521421502 has 4 divisors (see below), whose sum is σ = 19685282132256. Its totient is φ = 6561760710750.

The previous prime is 13123521421501. The next prime is 13123521421523. The reversal of 13123521421502 is 20512412532131.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123521421501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280880355374 + ... + 3280880355377.

It is an arithmetic number, because the mean of its divisors is an integer number (4921320533064).

Almost surely, 2^{13123521421502} is an apocalyptic number.

13123521421502 is a deficient number, since it is larger than the sum of its proper divisors (6561760710754).

13123521421502 is an equidigital number, since it uses as much as digits as its factorization.

13123521421502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561760710753.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 13123521421502 its reverse (20512412532131), we get a palindrome (33635933953633).

The spelling of 13123521421502 in words is "thirteen trillion, one hundred twenty-three billion, five hundred twenty-one million, four hundred twenty-one thousand, five hundred two".