1231621423502 has 24 divisors (see below), whose sum is σ = 1880146709784. Its totient is φ = 605089747152.

The previous prime is 1231621423499. The next prime is 1231621423517. The reversal of 1231621423502 is 2053241261321.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3391493 + ... + 3737039.

It is an arithmetic number, because the mean of its divisors is an integer number (78339446241).

Almost surely, 2^{1231621423502} is an apocalyptic number.

1231621423502 is a deficient number, since it is larger than the sum of its proper divisors (648525286282).

1231621423502 is an equidigital number, since it uses as much as digits as its factorization.

1231621423502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346080 (or 346013 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 1231621423502 its reverse (2053241261321), we get a palindrome (3284862684823).

The spelling of 1231621423502 in words is "one trillion, two hundred thirty-one billion, six hundred twenty-one million, four hundred twenty-three thousand, five hundred two".