1142021100 has 144 divisors (see below), whose sum is σ = 3620768256. Its totient is φ = 275616000.

The previous prime is 1142021071. The next prime is 1142021107. The reversal of 1142021100 is 11202411.

It is a happy number.

It is a super-4 number, since 4×1142021100⁴ (a number of 37 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1142021107) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 893662 + ... + 894938.

It is an arithmetic number, because the mean of its divisors is an integer number (25144224).

Almost surely, 2^1142021100 is an apocalyptic number.

1142021100 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 1142021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1810384128).

1142021100 is an abundant number, since it is smaller than the sum of its proper divisors (2478747156).

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

1142021100 is a wasteful number, since it uses less digits than its factorization.

1142021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1142021100 is about 33793.8026862915. The cubic root of 1142021100 is about 1045.2609102569.

Adding to 1142021100 its reverse (11202411), we get a palindrome (1153223511).

The spelling of 1142021100 in words is "one billion, one hundred forty-two million, twenty-one thousand, one hundred".