2516142521 has 4 divisors (see below), whose sum is σ = 2516399844. Its totient is φ = 2515885200.

The previous prime is 2516142439. The next prime is 2516142533. The reversal of 2516142521 is 1252416152.

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 2066702521 + 449440000 = 45461^2 + 21200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2516142521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2516142821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113390 + ... + 133751.

It is an arithmetic number, because the mean of its divisors is an integer number (629099961).

Almost surely, 2^2516142521 is an apocalyptic number.

It is an amenable number.

2516142521 is a deficient number, since it is larger than the sum of its proper divisors (257323).

2516142521 is a wasteful number, since it uses less digits than its factorization.

2516142521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257322.

The product of its digits is 4800, while the sum is 29.

The square root of 2516142521 is about 50161.1654669227. The cubic root of 2516142521 is about 1360.1237129747.

Adding to 2516142521 its reverse (1252416152), we get a palindrome (3768558673).

The spelling of 2516142521 in words is "two billion, five hundred sixteen million, one hundred forty-two thousand, five hundred twenty-one".