20121530331424 has 12 divisors (see below), whose sum is σ = 39614262840054. Its totient is φ = 10060765165696.

The previous prime is 20121530331379. The next prime is 20121530331431. The reversal of 20121530331424 is 42413303512102.

It can be written as a sum of positive squares in only one way, i.e., 10979494315024 + 9142036016400 = 3313532^2 + 3023580^2 .

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 as a sum of consecutive naturals, namely, 314398911397 + ... + 314398911460.

Almost surely, 2^{20121530331424} is an apocalyptic number.

It is an amenable number.

20121530331424 is a deficient number, since it is larger than the sum of its proper divisors (19492732508630).

20121530331424 is an equidigital number, since it uses as much as digits as its factorization.

20121530331424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628797822867 (or 628797822859 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 20121530331424 its reverse (42413303512102), we get a palindrome (62534833843526).

The spelling of 20121530331424 in words is "twenty trillion, one hundred twenty-one billion, five hundred thirty million, three hundred thirty-one thousand, four hundred twenty-four".