215120004 has 96 divisors (see below), whose sum is σ = 565439616. Its totient is φ = 63098880.

The previous prime is 215119997. The next prime is 215120039. The reversal of 215120004 is 400021512.

It is a super-2 number, since 2×215120004² = 92553232241920032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 678454 + ... + 678770.

It is an arithmetic number, because the mean of its divisors is an integer number (5889996).

Almost surely, 2^215120004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215120004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282719808).

215120004 is an abundant number, since it is smaller than the sum of its proper divisors (350319612).

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

215120004 is a wasteful number, since it uses less digits than its factorization.

215120004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 215120004 is about 14666.9698302001. The cubic root of 215120004 is about 599.1840798490.

Adding to 215120004 its reverse (400021512), we get a palindrome (615141516).

It can be divided in two parts, 2151 and 20004, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 215120004 in words is "two hundred fifteen million, one hundred twenty thousand, four".