105121520 has 80 divisors (see below), whose sum is σ = 288999360. Its totient is φ = 34793472.

The previous prime is 105121517. The next prime is 105121529. The reversal of 105121520 is 25121501.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×105121520² = 22101067934220800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105121529) 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, 13004 + ... + 19476.

It is an arithmetic number, because the mean of its divisors is an integer number (3612492).

Almost surely, 2^105121520 is an apocalyptic number.

105121520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 105121520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144499680).

105121520 is an abundant number, since it is smaller than the sum of its proper divisors (183877840).

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

105121520 is a wasteful number, since it uses less digits than its factorization.

105121520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6522 (or 6516 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 105121520 is about 10252.8786201730. The cubic root of 105121520 is about 471.9513260159.

The spelling of 105121520 in words is "one hundred five million, one hundred twenty-one thousand, five hundred twenty".