216416620421 has 8 divisors (see below), whose sum is σ = 217640027520. Its totient is φ = 215193373408.

The previous prime is 216416620373. The next prime is 216416620439. The reversal of 216416620421 is 124026614612.

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-216416620421 is a prime.

It is a super-3 number, since 3×216416620421³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216416620621) 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, 3603380 + ... + 3662946.

It is an arithmetic number, because the mean of its divisors is an integer number (27205003440).

Almost surely, 2^216416620421 is an apocalyptic number.

It is an amenable number.

216416620421 is a deficient number, since it is larger than the sum of its proper divisors (1223407099).

216416620421 is a wasteful number, since it uses less digits than its factorization.

216416620421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80043.

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 216416620421 in words is "two hundred sixteen billion, four hundred sixteen million, six hundred twenty thousand, four hundred twenty-one".