1012121010000 has 300 divisors, whose sum is σ = 3747746877732. Its totient is φ = 254022144000.

The previous prime is 1012121009993. The next prime is 1012121010037. The reversal of 1012121010000 is 101212101.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 383601854736 + 628519155264 = 619356^2 + 792792^2 .

It is a tau number, because it is divible by the number of its divisors (300).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1199242 + ... + 1860758.

Almost surely, 2^{1012121010000} is an apocalyptic number.

1012121010000 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 1012121010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1873873438866).

1012121010000 is an abundant number, since it is smaller than the sum of its proper divisors (2735625867732).

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

1012121010000 is a wasteful number, since it uses less digits than its factorization.

1012121010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661568 (or 661544 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1012121010000 its reverse (101212101), we get a palindrome (1012222222101).

1012121010000 divided by its reverse (101212101) gives a 4-th power (10000 = 10⁴).

The spelling of 1012121010000 in words is "one trillion, twelve billion, one hundred twenty-one million, ten thousand".