1021021121971 has 2 divisors, whose sum is σ = 1021021121972. Its totient is φ = 1021021121970.

The previous prime is 1021021121959. The next prime is 1021021122001. The reversal of 1021021121971 is 1791211201201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021021121971 - 2⁷ = 1021021121843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021021121671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510560985 + 510510560986.

It is an arithmetic number, because the mean of its divisors is an integer number (510510560986).

Almost surely, 2^{1021021121971} is an apocalyptic number.

1021021121971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021021121971 is an equidigital number, since it uses as much as digits as its factorization.

1021021121971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 28.

The spelling of 1021021121971 in words is "one trillion, twenty-one billion, twenty-one million, one hundred twenty-one thousand, nine hundred seventy-one".