12121011210100 has 36 divisors (see below), whose sum is σ = 28325870815564. Its totient is φ = 4475450292480.

The previous prime is 12121011210043. The next prime is 12121011210101. The reversal of 12121011210100 is 101211012121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3055203351396 + 9065807858704 = 1747914^2 + 3010948^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121011210101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4661926089 + ... + 4661928688.

Almost surely, 2^{12121011210100} is an apocalyptic number.

12121011210100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121011210100 is an abundant number, since it is smaller than the sum of its proper divisors (16204859605464).

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

12121011210100 is a wasteful number, since it uses less digits than its factorization.

12121011210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323854804 (or 9323854797 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12121011210100 its reverse (101211012121), we get a palindrome (12222222222221).

The spelling of 12121011210100 in words is "twelve trillion, one hundred twenty-one billion, eleven million, two hundred ten thousand, one hundred".