212820097 has 4 divisors (see below), whose sum is σ = 243222976. Its totient is φ = 182417220.

The previous prime is 212820017. The next prime is 212820107. The reversal of 212820097 is 790028212.

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 a de Polignac number, because none of the positive numbers 2^k-212820097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212820017) 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, 15201429 + ... + 15201442.

It is an arithmetic number, because the mean of its divisors is an integer number (60805744).

Almost surely, 2^212820097 is an apocalyptic number.

It is an amenable number.

212820097 is a deficient number, since it is larger than the sum of its proper divisors (30402879).

212820097 is an equidigital number, since it uses as much as digits as its factorization.

212820097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30402878.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 212820097 is about 14588.3548421335. The cubic root of 212820097 is about 597.0410773184.

The spelling of 212820097 in words is "two hundred twelve million, eight hundred twenty thousand, ninety-seven".