121211110000 has 100 divisors (see below), whose sum is σ = 296372274264. Its totient is φ = 48004000000.

The previous prime is 121211109991. The next prime is 121211110001. The reversal of 121211110000 is 11112121.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211110001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 949995 + ... + 1070005.

Almost surely, 2^121211110000 is an apocalyptic number.

121211110000 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 121211110000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148186137132).

121211110000 is an abundant number, since it is smaller than the sum of its proper divisors (175161164264).

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

121211110000 is a wasteful number, since it uses less digits than its factorization.

121211110000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120140 (or 120119 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121211110000 its reverse (11112121), we get a palindrome (121222222121).

The spelling of 121211110000 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred ten thousand".