211021121120009 has 4 divisors (see below), whose sum is σ = 213993249586560. Its totient is φ = 208048992653460.

The previous prime is 211021121119993. The next prime is 211021121120023. The reversal of 211021121120009 is 900021121120112.

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 211021121120009 - 2⁴ = 211021121119993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211021121120059) 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, 1486064233169 + ... + 1486064233310.

It is an arithmetic number, because the mean of its divisors is an integer number (53498312396640).

Almost surely, 2^{211021121120009} is an apocalyptic number.

It is an amenable number.

211021121120009 is a deficient number, since it is larger than the sum of its proper divisors (2972128466551).

211021121120009 is an equidigital number, since it uses as much as digits as its factorization.

211021121120009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972128466550.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 211021121120009 in words is "two hundred eleven trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, nine".