211121121947 has 2 divisors, whose sum is σ = 211121121948. Its totient is φ = 211121121946.

The previous prime is 211121121917. The next prime is 211121121961. The reversal of 211121121947 is 749121121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211121121947 - 2¹⁶ = 211121056411 is a prime.

It is not a weakly prime, because it can be changed into another prime (211121121917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560560973 + 105560560974.

It is an arithmetic number, because the mean of its divisors is an integer number (105560560974).

Almost surely, 2^211121121947 is an apocalyptic number.

211121121947 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121121947 is an equidigital number, since it uses as much as digits as its factorization.

211121121947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 32.

The spelling of 211121121947 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, nine hundred forty-seven".