1125122021 has 8 divisors (see below), whose sum is σ = 1139726784. Its totient is φ = 1110542400.

The previous prime is 1125121997. The next prime is 1125122023. The reversal of 1125122021 is 1202215211.

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 1125122021 - 2⁶ = 1125121957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125122023) 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, 94040 + ... + 105326.

It is an arithmetic number, because the mean of its divisors is an integer number (142465848).

Almost surely, 2^1125122021 is an apocalyptic number.

It is an amenable number.

1125122021 is a deficient number, since it is larger than the sum of its proper divisors (14604763).

1125122021 is a wasteful number, since it uses less digits than its factorization.

1125122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12571.

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

The square root of 1125122021 is about 33542.8385948476. The cubic root of 1125122021 is about 1040.0795122270.

Adding to 1125122021 its reverse (1202215211), we get a palindrome (2327337232).

The spelling of 1125122021 in words is "one billion, one hundred twenty-five million, one hundred twenty-two thousand, twenty-one".