20121131333320 has 64 divisors (see below), whose sum is σ = 48943292500800. Its totient is φ = 7418772737280.

The previous prime is 20121131333293. The next prime is 20121131333321. The reversal of 20121131333320 is 2333313112102.

It is a super-2 number, since 2×20121131333320² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20121131333321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357744486 + ... + 357800725.

It is an arithmetic number, because the mean of its divisors is an integer number (764738945325).

Almost surely, 2^{20121131333320} is an apocalyptic number.

20121131333320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121131333320 is an abundant number, since it is smaller than the sum of its proper divisors (28822161167480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121131333320 is a wasteful number, since it uses less digits than its factorization.

20121131333320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715545278 (or 715545274 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 20121131333320 its reverse (2333313112102), we get a palindrome (22454444445422).

It can be divided in two parts, 2012113 and 1333320, that added together give a palindrome (3345433).

The spelling of 20121131333320 in words is "twenty trillion, one hundred twenty-one billion, one hundred thirty-one million, three hundred thirty-three thousand, three hundred twenty".