1011211001200 has 120 divisors (see below), whose sum is σ = 2447935326576. Its totient is φ = 401415168000.

The previous prime is 1011211001197. The next prime is 1011211001287. The reversal of 1011211001200 is 21001121101.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29776230 + ... + 29810170.

Almost surely, 2^{1011211001200} is an apocalyptic number.

1011211001200 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 1011211001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1223967663288).

1011211001200 is an abundant number, since it is smaller than the sum of its proper divisors (1436724325376).

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

1011211001200 is a wasteful number, since it uses less digits than its factorization.

1011211001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34523 (or 34512 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1011211001200 its reverse (21001121101), we get a palindrome (1032212122301).

The spelling of 1011211001200 in words is "one trillion, eleven billion, two hundred eleven million, one thousand, two hundred".