2516451421 has 16 divisors (see below), whose sum is σ = 2809644480. Its totient is φ = 2234494080.

The previous prime is 2516451419. The next prime is 2516451439. The reversal of 2516451421 is 1241546152.

It is a happy number.

2516451421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2516451421 - 2¹ = 2516451419 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 (2516451451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89545 + ... + 114241.

It is an arithmetic number, because the mean of its divisors is an integer number (175602780).

Almost surely, 2^2516451421 is an apocalyptic number.

It is an amenable number.

2516451421 is a deficient number, since it is larger than the sum of its proper divisors (293193059).

2516451421 is a wasteful number, since it uses less digits than its factorization.

2516451421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24924.

The product of its digits is 9600, while the sum is 31.

The square root of 2516451421 is about 50164.2444476143. The cubic root of 2516451421 is about 1360.1793702648.

Adding to 2516451421 its reverse (1241546152), we get a palindrome (3757997573).

The spelling of 2516451421 in words is "two billion, five hundred sixteen million, four hundred fifty-one thousand, four hundred twenty-one".