2115252421 has 8 divisors (see below), whose sum is σ = 2248976664. Its totient is φ = 1982561280.

The previous prime is 2115252397. The next prime is 2115252449. The reversal of 2115252421 is 1242525112.

It can be written as a sum of positive squares in 4 ways, for example, as 565964100 + 1549288321 = 23790^2 + 39361^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115252421 is a prime.

It is a super-2 number, since 2×2115252421² = 8948585609092722482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115252221) 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, 254050 + ... + 262243.

It is an arithmetic number, because the mean of its divisors is an integer number (281122083).

Almost surely, 2^2115252421 is an apocalyptic number.

It is an amenable number.

2115252421 is a deficient number, since it is larger than the sum of its proper divisors (133724243).

2115252421 is a wasteful number, since it uses less digits than its factorization.

2115252421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516551.

The product of its digits is 1600, while the sum is 25.

The square root of 2115252421 is about 45991.8734234647. The cubic root of 2115252421 is about 1283.6719959797.

Adding to 2115252421 its reverse (1242525112), we get a palindrome (3357777533).

The spelling of 2115252421 in words is "two billion, one hundred fifteen million, two hundred fifty-two thousand, four hundred twenty-one".