2516021220 has 24 divisors (see below), whose sum is σ = 7044859584. Its totient is φ = 670938976.

The previous prime is 2516021213. The next prime is 2516021227. The reversal of 2516021220 is 221206152.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2516021213) and next prime (2516021227).

It is not an unprimeable number, because it can be changed into a prime (2516021227) 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, 20966784 + ... + 20966903.

It is an arithmetic number, because the mean of its divisors is an integer number (293535816).

Almost surely, 2^2516021220 is an apocalyptic number.

2516021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2516021220 is an abundant number, since it is smaller than the sum of its proper divisors (4528838364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2516021220 is a wasteful number, since it uses less digits than its factorization.

2516021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41933699 (or 41933697 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2516021220 is about 50159.9563396939. The cubic root of 2516021220 is about 1360.1018558374.

Adding to 2516021220 its reverse (221206152), we get a palindrome (2737227372).

The spelling of 2516021220 in words is "two billion, five hundred sixteen million, twenty-one thousand, two hundred twenty".