1011211240 has 64 divisors (see below), whose sum is σ = 2453996160. Its totient is φ = 372798720.

The previous prime is 1011211231. The next prime is 1011211277. The reversal of 1011211240 is 421121101.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 1011211240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501835 + ... + 503845.

It is an arithmetic number, because the mean of its divisors is an integer number (38343690).

Almost surely, 2^1011211240 is an apocalyptic number.

1011211240 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 1011211240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226998080).

1011211240 is an abundant number, since it is smaller than the sum of its proper divisors (1442784920).

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

1011211240 is a wasteful number, since it uses less digits than its factorization.

1011211240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002 (or 2998 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1011211240 is about 31799.5477955269. The cubic root of 1011211240 is about 1003.7232005735.

Adding to 1011211240 its reverse (421121101), we get a palindrome (1432332341).

The spelling of 1011211240 in words is "one billion, eleven million, two hundred eleven thousand, two hundred forty".