20121442555 has 8 divisors (see below), whose sum is σ = 24371392752. Its totient is φ = 15946712928.

The previous prime is 20121442543. The next prime is 20121442603. The reversal of 20121442555 is 55524412102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121442555 - 2⁷ = 20121442427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18804552 + ... + 18805621.

It is an arithmetic number, because the mean of its divisors is an integer number (3046424094).

Almost surely, 2^20121442555 is an apocalyptic number.

20121442555 is a deficient number, since it is larger than the sum of its proper divisors (4249950197).

20121442555 is a wasteful number, since it uses less digits than its factorization.

20121442555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37610285.

The product of its (nonzero) digits is 16000, while the sum is 31.

Adding to 20121442555 its reverse (55524412102), we get a palindrome (75645854657).

The spelling of 20121442555 in words is "twenty billion, one hundred twenty-one million, four hundred forty-two thousand, five hundred fifty-five".