1011121521 has 8 divisors (see below), whose sum is σ = 1364405280. Its totient is φ = 665959392.

The previous prime is 1011121483. The next prime is 1011121523. The reversal of 1011121521 is 1251211101.

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

It is a de Polignac number, because none of the positive numbers 2^k-1011121521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011121521.

It is not an unprimeable number, because it can be changed into a prime (1011121523) 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, 2030116 + ... + 2030613.

It is an arithmetic number, because the mean of its divisors is an integer number (170550660).

Almost surely, 2^1011121521 is an apocalyptic number.

It is an amenable number.

1011121521 is a deficient number, since it is larger than the sum of its proper divisors (353283759).

1011121521 is an equidigital number, since it uses as much as digits as its factorization.

1011121521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060815.

The product of its (nonzero) digits is 20, while the sum is 15.

The square root of 1011121521 is about 31798.1370680737. The cubic root of 1011121521 is about 1003.6935148192.

Adding to 1011121521 its reverse (1251211101), we get a palindrome (2262332622).

The spelling of 1011121521 in words is "one billion, eleven million, one hundred twenty-one thousand, five hundred twenty-one".