1021220021947 has 2 divisors, whose sum is σ = 1021220021948. Its totient is φ = 1021220021946.

The previous prime is 1021220021923. The next prime is 1021220022019. The reversal of 1021220021947 is 7491200221201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021220021947 - 2¹⁹ = 1021219497659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021220021147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610010973 + 510610010974.

It is an arithmetic number, because the mean of its divisors is an integer number (510610010974).

Almost surely, 2^{1021220021947} is an apocalyptic number.

1021220021947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021220021947 is an equidigital number, since it uses as much as digits as its factorization.

1021220021947 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 1021220021947 in words is "one trillion, twenty-one billion, two hundred twenty million, twenty-one thousand, nine hundred forty-seven".