212516518451 has 16 divisors (see below), whose sum is σ = 217902182400. Its totient is φ = 207191563488.

The previous prime is 212516518381. The next prime is 212516518463. The reversal of 212516518451 is 154815615212.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212516518451 is a prime.

It is a super-2 number, since 2×212516518451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212516518399 and 212516518408.

It is not an unprimeable number, because it can be changed into a prime (212516518351) 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, 37484645 + ... + 37490313.

It is an arithmetic number, because the mean of its divisors is an integer number (13618886400).

Almost surely, 2^212516518451 is an apocalyptic number.

212516518451 is a deficient number, since it is larger than the sum of its proper divisors (5385663949).

212516518451 is a wasteful number, since it uses less digits than its factorization.

212516518451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10858.

The product of its digits is 96000, while the sum is 41.

The spelling of 212516518451 in words is "two hundred twelve billion, five hundred sixteen million, five hundred eighteen thousand, four hundred fifty-one".