2521401121 has 4 divisors (see below), whose sum is σ = 2669718852. Its totient is φ = 2373083392.

The previous prime is 2521401107. The next prime is 2521401193. The reversal of 2521401121 is 1211041252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1555434721 + 965966400 = 39439^2 + 31080^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521401121 - 2⁷ = 2521400993 is a prime.

It is a super-2 number, since 2×2521401121² = 12714927225960113282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521405121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74158840 + ... + 74158873.

It is an arithmetic number, because the mean of its divisors is an integer number (667429713).

Almost surely, 2^2521401121 is an apocalyptic number.

It is an amenable number.

2521401121 is a deficient number, since it is larger than the sum of its proper divisors (148317731).

2521401121 is a wasteful number, since it uses less digits than its factorization.

2521401121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148317730.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2521401121 is about 50213.5551519707. Note that the first 3 decimals coincide. The cubic root of 2521401121 is about 1361.0705816575.

Adding to 2521401121 its reverse (1211041252), we get a palindrome (3732442373).

The spelling of 2521401121 in words is "two billion, five hundred twenty-one million, four hundred one thousand, one hundred twenty-one".