2115535421 has 8 divisors (see below), whose sum is σ = 2184722904. Its totient is φ = 2046980160.

The previous prime is 2115535399. The next prime is 2115535427. The reversal of 2115535421 is 1245355112.

It can be written as a sum of positive squares in 4 ways, for example, as 796029796 + 1319505625 = 28214^2 + 36325^2 .

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 2115535421 - 2¹⁰ = 2115534397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115535427) 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, 151250 + ... + 164643.

It is an arithmetic number, because the mean of its divisors is an integer number (273090363).

Almost surely, 2^2115535421 is an apocalyptic number.

It is an amenable number.

2115535421 is a deficient number, since it is larger than the sum of its proper divisors (69187483).

2115535421 is a wasteful number, since it uses less digits than its factorization.

2115535421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316111.

The product of its digits is 6000, while the sum is 29.

The square root of 2115535421 is about 45994.9499510544. The cubic root of 2115535421 is about 1283.7292409955.

The spelling of 2115535421 in words is "two billion, one hundred fifteen million, five hundred thirty-five thousand, four hundred twenty-one".