1021211200000 has 240 divisors, whose sum is σ = 2556760919328. Its totient is φ = 407462400000.

The previous prime is 1021211199979. The next prime is 1021211200001. The reversal of 1021211200000 is 21121201.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1021211200000.

It is not an unprimeable number, because it can be changed into a prime (1021211200001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1259199595 + ... + 1259200405.

Almost surely, 2^{1021211200000} is an apocalyptic number.

1021211200000 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 1021211200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278380459664).

1021211200000 is an abundant number, since it is smaller than the sum of its proper divisors (1535549719328).

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

1021211200000 is an frugal number, since it uses more digits than its factorization.

1021211200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641 (or 1605 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1021211200000 its reverse (21121201), we get a palindrome (1021232321201).

The spelling of 1021211200000 in words is "one trillion, twenty-one billion, two hundred eleven million, two hundred thousand".