121000021010000 has 400 divisors, whose sum is σ = 322977442334976. Its totient is φ = 43533600000000.

The previous prime is 121000021009993. The next prime is 121000021010051. The reversal of 121000021010000 is 10120000121.

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

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 121000021010000.

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, 20786807090 + ... + 20786812910.

Almost surely, 2^{121000021010000} is an apocalyptic number.

121000021010000 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 121000021010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161488721167488).

121000021010000 is an abundant number, since it is smaller than the sum of its proper divisors (201977421324976).

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

121000021010000 is a wasteful number, since it uses less digits than its factorization.

121000021010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832 (or 7811 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 121000021010000 its reverse (10120000121), we get a palindrome (121010141010121).

The spelling of 121000021010000 in words is "one hundred twenty-one trillion, twenty-one million, ten thousand".