102121221947 has 2 divisors, whose sum is σ = 102121221948. Its totient is φ = 102121221946.

The previous prime is 102121221919. The next prime is 102121221949. The reversal of 102121221947 is 749122121201.

It is a strong prime.

It is an emirp because it is prime and its reverse (749122121201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102121221947 is a prime.

It is a super-3 number, since 3×102121221947³ (a number of 34 digits) contains 333 as substring.

Together with 102121221949, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102121221949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060610973 + 51060610974.

It is an arithmetic number, because the mean of its divisors is an integer number (51060610974).

Almost surely, 2^102121221947 is an apocalyptic number.

102121221947 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121221947 is an equidigital number, since it uses as much as digits as its factorization.

102121221947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 102121221947 in words is "one hundred two billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred forty-seven".