121212021010000 has 400 divisors, whose sum is σ = 310061561040000. Its totient is φ = 45798711552000.

The previous prime is 121212021009887. The next prime is 121212021010027. The reversal of 121212021010000 is 10120212121.

It is a tau number, because it is divible by the number of its divisors (400).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7696482126 + ... + 7696497874.

It is an arithmetic number, because the mean of its divisors is an integer number (775153902600).

Almost surely, 2^{121212021010000} is an apocalyptic number.

121212021010000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121212021010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155030780520000).

121212021010000 is an abundant number, since it is smaller than the sum of its proper divisors (188849540030000).

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

121212021010000 is a wasteful number, since it uses less digits than its factorization.

121212021010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16216 (or 16195 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121212021010000 its reverse (10120212121), we get a palindrome (121222141222121).

The spelling of 121212021010000 in words is "one hundred twenty-one trillion, two hundred twelve billion, twenty-one million, ten thousand".