1121615621 has 8 divisors (see below), whose sum is σ = 1283097984. Its totient is φ = 960446160.

The previous prime is 1121615609. The next prime is 1121615641. The reversal of 1121615621 is 1265161211.

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 1121615621 - 2³⁰ = 47873797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121615641) 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, 70490 + ... + 84923.

It is an arithmetic number, because the mean of its divisors is an integer number (160387248).

Almost surely, 2^1121615621 is an apocalyptic number.

It is an amenable number.

1121615621 is a deficient number, since it is larger than the sum of its proper divisors (161482363).

1121615621 is a wasteful number, since it uses less digits than its factorization.

1121615621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156451.

The product of its digits is 720, while the sum is 26.

The square root of 1121615621 is about 33490.5303182855. The cubic root of 1121615621 is about 1038.9979317946.

Adding to 1121615621 its reverse (1265161211), we get a palindrome (2386776832).

The spelling of 1121615621 in words is "one billion, one hundred twenty-one million, six hundred fifteen thousand, six hundred twenty-one".