215220426 has 32 divisors (see below), whose sum is σ = 454775040. Its totient is φ = 67790016.

The previous prime is 215220409. The next prime is 215220431. The reversal of 215220426 is 624022512.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215220396 and 215220405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4981 + ... + 21336.

It is an arithmetic number, because the mean of its divisors is an integer number (14211720).

Almost surely, 2^215220426 is an apocalyptic number.

215220426 is an abundant number, since it is smaller than the sum of its proper divisors (239554614).

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

215220426 is a wasteful number, since it uses less digits than its factorization.

215220426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26398.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 215220426 is about 14670.3928372760. The cubic root of 215220426 is about 599.2773020846.

Adding to 215220426 its reverse (624022512), we get a palindrome (839242938).

It can be divided in two parts, 2152 and 20426, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 215220426 in words is "two hundred fifteen million, two hundred twenty thousand, four hundred twenty-six".