2105122520 has 16 divisors (see below), whose sum is σ = 4736525760. Its totient is φ = 842048992.

The previous prime is 2105122493. The next prime is 2105122531. The reversal of 2105122520 is 252215012.

It is a happy number.

It is a super-2 number, since 2×2105122520² = 8863081648422300800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2105122492 and 2105122501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26313992 + ... + 26314071.

It is an arithmetic number, because the mean of its divisors is an integer number (296032860).

Almost surely, 2^2105122520 is an apocalyptic number.

2105122520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105122520 is an abundant number, since it is smaller than the sum of its proper divisors (2631403240).

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

2105122520 is a wasteful number, since it uses less digits than its factorization.

2105122520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52628074 (or 52628070 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2105122520 is about 45881.6141825895. The cubic root of 2105122520 is about 1281.6195563913.

Adding to 2105122520 its reverse (252215012), we get a palindrome (2357337532).

The spelling of 2105122520 in words is "two billion, one hundred five million, one hundred twenty-two thousand, five hundred twenty".