20121202100 has 18 divisors (see below), whose sum is σ = 43663008774. Its totient is φ = 8048480800.

The previous prime is 20121202093. The next prime is 20121202117. The reversal of 20121202100 is 120212102.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 429815824 + 19691386276 = 20732^2 + 140326^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100605911 + ... + 100606110.

Almost surely, 2^20121202100 is an apocalyptic number.

20121202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121202100 is an abundant number, since it is smaller than the sum of its proper divisors (23541806674).

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

20121202100 is a wasteful number, since it uses less digits than its factorization.

20121202100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201212035 (or 201212028 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20121202100 its reverse (120212102), we get a palindrome (20241414202).

The spelling of 20121202100 in words is "twenty billion, one hundred twenty-one million, two hundred two thousand, one hundred".