121021019947 has 2 divisors, whose sum is σ = 121021019948. Its totient is φ = 121021019946.

The previous prime is 121021019929. The next prime is 121021020019. The reversal of 121021019947 is 749910120121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121021019947 - 2²⁷ = 120886802219 is a prime.

It is not a weakly prime, because it can be changed into another prime (121021019747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510509973 + 60510509974.

It is an arithmetic number, because the mean of its divisors is an integer number (60510509974).

Almost surely, 2^121021019947 is an apocalyptic number.

121021019947 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021019947 is an equidigital number, since it uses as much as digits as its factorization.

121021019947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 121021019947 in words is "one hundred twenty-one billion, twenty-one million, nineteen thousand, nine hundred forty-seven".