215151042021 has 16 divisors (see below), whose sum is σ = 296793140160. Its totient is φ = 138472588800.

The previous prime is 215151041953. The next prime is 215151042047. The reversal of 215151042021 is 120240151512.

It is a happy number.

It is not a de Polignac number, because 215151042021 - 2¹⁵ = 215151009253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215151041982 and 215151042000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215151042721) 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, 674421 + ... + 940821.

It is an arithmetic number, because the mean of its divisors is an integer number (18549571260).

Almost surely, 2^215151042021 is an apocalyptic number.

It is an amenable number.

215151042021 is a deficient number, since it is larger than the sum of its proper divisors (81642098139).

215151042021 is a wasteful number, since it uses less digits than its factorization.

215151042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275716.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 215151042021 its reverse (120240151512), we get a palindrome (335391193533).

The spelling of 215151042021 in words is "two hundred fifteen billion, one hundred fifty-one million, forty-two thousand, twenty-one".