20121202512 has 30 divisors (see below), whose sum is σ = 56311421322. Its totient is φ = 6707067456.

The previous prime is 20121202487. The next prime is 20121202513. The reversal of 20121202512 is 21520212102.

20121202512 is a `hidden beast` number, since 20 + 12 + 120 + 2 + 512 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19634735376 + 486467136 = 140124^2 + 22056^2 .

It is a super-2 number, since 2×20121202512² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121202513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69865143 + ... + 69865430.

Almost surely, 2^20121202512 is an apocalyptic number.

It is an amenable number.

20121202512 is an abundant number, since it is smaller than the sum of its proper divisors (36190218810).

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

20121202512 is a wasteful number, since it uses less digits than its factorization.

20121202512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139730587 (or 139730578 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 20121202512 its reverse (21520212102), we get a palindrome (41641414614).

The spelling of 20121202512 in words is "twenty billion, one hundred twenty-one million, two hundred two thousand, five hundred twelve".