212040817 has 4 divisors (see below), whose sum is σ = 223200880. Its totient is φ = 200880756.

The previous prime is 212040799. The next prime is 212040827. The reversal of 212040817 is 718040212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212040817 - 2¹¹ = 212038769 is a prime.

It is a super-2 number, since 2×212040817² = 89922616148054978, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212040791 and 212040800.

It is not an unprimeable number, because it can be changed into a prime (212040827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5580003 + ... + 5580040.

It is an arithmetic number, because the mean of its divisors is an integer number (55800220).

Almost surely, 2^212040817 is an apocalyptic number.

It is an amenable number.

212040817 is a deficient number, since it is larger than the sum of its proper divisors (11160063).

212040817 is a wasteful number, since it uses less digits than its factorization.

212040817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11160062.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 212040817 is about 14561.6213726357. The cubic root of 212040817 is about 596.3114607449.

The spelling of 212040817 in words is "two hundred twelve million, forty thousand, eight hundred seventeen".