1021012200000 has 504 divisors, whose sum is σ = 3939420814056. Its totient is φ = 251320320000.

The previous prime is 1021012199957. The next prime is 1021012200031. The reversal of 1021012200000 is 22101201.

It can be written as a sum of positive squares in 12 ways, for example, as 1010652217344 + 10359982656 = 1005312^2 + 101784^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 23378184 + ... + 23421816.

It is an arithmetic number, because the mean of its divisors is an integer number (7816311139).

Almost surely, 2^{1021012200000} is an apocalyptic number.

1021012200000 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 1021012200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1969710407028).

1021012200000 is an abundant number, since it is smaller than the sum of its proper divisors (2918408614056).

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

1021012200000 is an equidigital number, since it uses as much as digits as its factorization.

1021012200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43689 (or 43656 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1021012200000 its reverse (22101201), we get a palindrome (1021034301201).

The spelling of 1021012200000 in words is "one trillion, twenty-one billion, twelve million, two hundred thousand".