20121111232013 has 16 divisors (see below), whose sum is σ = 22951313321472. Its totient is φ = 17460983694000.

The previous prime is 20121111231979. The next prime is 20121111232037. The reversal of 20121111232013 is 31023211112102.

It is a de Polignac number, because none of the positive numbers 2^k-20121111232013 is a prime.

It is a super-2 number, since 2×20121111232013² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121111238013) 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, 80863643 + ... + 81112088.

It is an arithmetic number, because the mean of its divisors is an integer number (1434457082592).

Almost surely, 2^{20121111232013} is an apocalyptic number.

20121111232013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20121111232013 is a deficient number, since it is larger than the sum of its proper divisors (2830202089459).

20121111232013 is a wasteful number, since it uses less digits than its factorization.

20121111232013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161976256.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20121111232013 its reverse (31023211112102), we get a palindrome (51144322344115).

The spelling of 20121111232013 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, two hundred thirty-two thousand, thirteen".