2153121947 has 2 divisors, whose sum is σ = 2153121948. Its totient is φ = 2153121946.

The previous prime is 2153121917. The next prime is 2153122033. The reversal of 2153121947 is 7491213512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2153121947 - 2¹⁸ = 2152859803 is a prime.

It is not a weakly prime, because it can be changed into another prime (2153121917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076560973 + 1076560974.

It is an arithmetic number, because the mean of its divisors is an integer number (1076560974).

Almost surely, 2^2153121947 is an apocalyptic number.

2153121947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153121947 is an equidigital number, since it uses as much as digits as its factorization.

2153121947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 2153121947 is about 46401.7450857185. The cubic root of 2153121947 is about 1291.2872887931.

The spelling of 2153121947 in words is "two billion, one hundred fifty-three million, one hundred twenty-one thousand, nine hundred forty-seven".