212017330371721 has 4 divisors (see below), whose sum is σ = 242305520424832. Its totient is φ = 181729140318612.

The previous prime is 212017330371709. The next prime is 212017330371823. The reversal of 212017330371721 is 127173033710212.

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 212017330371721 - 2²⁷ = 212017196153993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212017330372721) 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, 15144095026545 + ... + 15144095026558.

It is an arithmetic number, because the mean of its divisors is an integer number (60576380106208).

Almost surely, 2^{212017330371721} is an apocalyptic number.

It is an amenable number.

212017330371721 is a deficient number, since it is larger than the sum of its proper divisors (30288190053111).

212017330371721 is an equidigital number, since it uses as much as digits as its factorization.

212017330371721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30288190053110.

The product of its (nonzero) digits is 74088, while the sum is 40.

The spelling of 212017330371721 in words is "two hundred twelve trillion, seventeen billion, three hundred thirty million, three hundred seventy-one thousand, seven hundred twenty-one".