215430817421 has 8 divisors (see below), whose sum is σ = 221351964288. Its totient is φ = 209541420000.

The previous prime is 215430817369. The next prime is 215430817447. The reversal of 215430817421 is 124718034512.

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 a de Polignac number, because none of the positive numbers 2^k-215430817421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215430837421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7923605 + ... + 7950746.

It is an arithmetic number, because the mean of its divisors is an integer number (27668995536).

Almost surely, 2^215430817421 is an apocalyptic number.

It is an amenable number.

215430817421 is a deficient number, since it is larger than the sum of its proper divisors (5921146867).

215430817421 is a wasteful number, since it uses less digits than its factorization.

215430817421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15874723.

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 215430817421 in words is "two hundred fifteen billion, four hundred thirty million, eight hundred seventeen thousand, four hundred twenty-one".