172021107216 has 80 divisors (see below), whose sum is σ = 515025036288. Its totient is φ = 48456643200.

The previous prime is 172021107199. The next prime is 172021107217. The reversal of 172021107216 is 612701120271.

It is a super-2 number, since 2×172021107216² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172021107217) 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, 3581550 + ... + 3629261.

Almost surely, 2^172021107216 is an apocalyptic number.

172021107216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172021107216 is an abundant number, since it is smaller than the sum of its proper divisors (343003929072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172021107216 is a wasteful number, since it uses less digits than its factorization.

172021107216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210900 (or 7210894 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 30.

Adding to 172021107216 its reverse (612701120271), we get a palindrome (784722227487).

The spelling of 172021107216 in words is "one hundred seventy-two billion, twenty-one million, one hundred seven thousand, two hundred sixteen".