65220215421 has 8 divisors (see below), whose sum is σ = 87030934144. Its totient is φ = 43444820160.

The previous prime is 65220215419. The next prime is 65220215453. The reversal of 65220215421 is 12451202256.

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

It is not a de Polignac number, because 65220215421 - 2¹ = 65220215419 is a prime.

It is a super-3 number, since 3×65220215421³ (a number of 33 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 (65220216421) 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, 8826556 + ... + 8833941.

It is an arithmetic number, because the mean of its divisors is an integer number (10878866768).

Almost surely, 2^65220215421 is an apocalyptic number.

It is an amenable number.

65220215421 is a deficient number, since it is larger than the sum of its proper divisors (21810718723).

65220215421 is a wasteful number, since it uses less digits than its factorization.

65220215421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17661731.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 65220215421 its reverse (12451202256), we get a palindrome (77671417677).

The spelling of 65220215421 in words is "sixty-five billion, two hundred twenty million, two hundred fifteen thousand, four hundred twenty-one".