1011211001000 has 64 divisors (see below), whose sum is σ = 2367845775360. Its totient is φ = 404208840000.

The previous prime is 1011211000999. The next prime is 1011211001039. The reversal of 1011211001000 is 1001121101.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1127285 + ... + 1814715.

It is an arithmetic number, because the mean of its divisors is an integer number (36997590240).

Almost surely, 2^{1011211001000} is an apocalyptic number.

1011211001000 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 1011211001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183922887680).

1011211001000 is an abundant number, since it is smaller than the sum of its proper divisors (1356634774360).

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

1011211001000 is a wasteful number, since it uses less digits than its factorization.

1011211001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688923 (or 688909 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1011211001000 its reverse (1001121101), we get a palindrome (1012212122101).

The spelling of 1011211001000 in words is "one trillion, eleven billion, two hundred eleven million, one thousand".