1100125421 has 8 divisors (see below), whose sum is σ = 1111854744. Its totient is φ = 1088458560.

The previous prime is 1100125417. The next prime is 1100125487. The reversal of 1100125421 is 1245210011.

It can be written as a sum of positive squares in 4 ways, for example, as 23629321 + 1076496100 = 4861^2 + 32810^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1100125421 - 2² = 1100125417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1100125421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100125321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20231 + ... + 51083.

It is an arithmetic number, because the mean of its divisors is an integer number (138981843).

Almost surely, 2^1100125421 is an apocalyptic number.

It is an amenable number.

1100125421 is a deficient number, since it is larger than the sum of its proper divisors (11729323).

1100125421 is a wasteful number, since it uses less digits than its factorization.

1100125421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31231.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1100125421 is about 33168.1386423779. The cubic root of 1100125421 is about 1032.3193471788.

Adding to 1100125421 its reverse (1245210011), we get a palindrome (2345335432).

The spelling of 1100125421 in words is "one billion, one hundred million, one hundred twenty-five thousand, four hundred twenty-one".