20212115155 has 8 divisors (see below), whose sum is σ = 24256353600. Its totient is φ = 16168481856.

The previous prime is 20212115149. The next prime is 20212115173. The reversal of 20212115155 is 55151121202.

It is a happy number.

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 20212115155 - 2²⁵ = 20178560723 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 74235 + ... + 214324.

It is an arithmetic number, because the mean of its divisors is an integer number (3032044200).

Almost surely, 2^20212115155 is an apocalyptic number.

20212115155 is a deficient number, since it is larger than the sum of its proper divisors (4044238445).

20212115155 is a wasteful number, since it uses less digits than its factorization.

20212115155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302573.

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 20212115155 its reverse (55151121202), we get a palindrome (75363236357).

The spelling of 20212115155 in words is "twenty billion, two hundred twelve million, one hundred fifteen thousand, one hundred fifty-five".