1020202121947 has 2 divisors, whose sum is σ = 1020202121948. Its totient is φ = 1020202121946.

The previous prime is 1020202121881. The next prime is 1020202121957. The reversal of 1020202121947 is 7491212020201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020202121947 - 2¹¹ = 1020202119899 is a prime.

It is a super-2 number, since 2×1020202121947² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1020202121957) 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, 510101060973 + 510101060974.

It is an arithmetic number, because the mean of its divisors is an integer number (510101060974).

Almost surely, 2^{1020202121947} is an apocalyptic number.

1020202121947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020202121947 is an equidigital number, since it uses as much as digits as its factorization.

1020202121947 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 31.

The spelling of 1020202121947 in words is "one trillion, twenty billion, two hundred two million, one hundred twenty-one thousand, nine hundred forty-seven".