2120401015 has 4 divisors (see below), whose sum is σ = 2544481224. Its totient is φ = 1696320808.

The previous prime is 2120400959. The next prime is 2120401021. The reversal of 2120401015 is 5101040212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2120401015 - 2¹⁵ = 2120368247 is a prime.

It is a super-2 number, since 2×2120401015² = 8992200928826060450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120401015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212040097 + ... + 212040106.

It is an arithmetic number, because the mean of its divisors is an integer number (636120306).

Almost surely, 2^2120401015 is an apocalyptic number.

2120401015 is a deficient number, since it is larger than the sum of its proper divisors (424080209).

2120401015 is an equidigital number, since it uses as much as digits as its factorization.

2120401015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424080208.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2120401015 is about 46047.8122715944. The cubic root of 2120401015 is about 1284.7126520656.

Adding to 2120401015 its reverse (5101040212), we get a palindrome (7221441227).

The spelling of 2120401015 in words is "two billion, one hundred twenty million, four hundred one thousand, fifteen".