1302102021991 has 2 divisors, whose sum is σ = 1302102021992. Its totient is φ = 1302102021990.

The previous prime is 1302102021989. The next prime is 1302102022031. The reversal of 1302102021991 is 1991202012031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1302102021991 - 2¹ = 1302102021989 is a prime.

Together with 1302102021989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1302102021091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651051010995 + 651051010996.

It is an arithmetic number, because the mean of its divisors is an integer number (651051010996).

Almost surely, 2^{1302102021991} is an apocalyptic number.

1302102021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1302102021991 is an equidigital number, since it uses as much as digits as its factorization.

1302102021991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 1302102021991 in words is "one trillion, three hundred two billion, one hundred two million, twenty-one thousand, nine hundred ninety-one".