20121055210 has 16 divisors (see below), whose sum is σ = 37466793000. Its totient is φ = 7770890176.

The previous prime is 20121055193. The next prime is 20121055217. The reversal of 20121055210 is 1255012102.

It can be written as a sum of positive squares in 4 ways, for example, as 13458088081 + 6662967129 = 116009^2 + 81627^2 .

It is not an unprimeable number, because it can be changed into a prime (20121055217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34691185 + ... + 34691764.

Almost surely, 2^20121055210 is an apocalyptic number.

20121055210 is a deficient number, since it is larger than the sum of its proper divisors (17345737790).

20121055210 is a wasteful number, since it uses less digits than its factorization.

20121055210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69382985.

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 20121055210 its reverse (1255012102), we get a palindrome (21376067312).

The spelling of 20121055210 in words is "twenty billion, one hundred twenty-one million, fifty-five thousand, two hundred ten".