216521125612 has 24 divisors (see below), whose sum is σ = 413643120912. Its totient is φ = 98350929600.

The previous prime is 216521125591. The next prime is 216521125679.

216521125612 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1629439 + ... + 1757302.

It is an arithmetic number, because the mean of its divisors is an integer number (17235130038).

Almost surely, 2^216521125612 is an apocalyptic number.

216521125612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

216521125612 is a deficient number, since it is larger than the sum of its proper divisors (197121995300).

216521125612 is a wasteful number, since it uses less digits than its factorization.

216521125612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388209 (or 3388207 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The spelling of 216521125612 in words is "two hundred sixteen billion, five hundred twenty-one million, one hundred twenty-five thousand, six hundred twelve".