215041421 has 8 divisors (see below), whose sum is σ = 256447104. Its totient is φ = 176307120.

The previous prime is 215041399. The next prime is 215041427. The reversal of 215041421 is 124140512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215041421 - 2⁶ = 215041357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215041393 and 215041402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215041427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667670 + ... + 667991.

It is an arithmetic number, because the mean of its divisors is an integer number (32055888).

Almost surely, 2^215041421 is an apocalyptic number.

It is an amenable number.

215041421 is a deficient number, since it is larger than the sum of its proper divisors (41405683).

215041421 is a wasteful number, since it uses less digits than its factorization.

215041421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335691.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 215041421 is about 14664.2906749696. The cubic root of 215041421 is about 599.1111106283. Note that the first 5 decimals are identical.

Adding to 215041421 its reverse (124140512), we get a palindrome (339181933).

Subtracting from 215041421 its reverse (124140512), we obtain a palindrome (90900909).

The spelling of 215041421 in words is "two hundred fifteen million, forty-one thousand, four hundred twenty-one".