1021506131287 has 2 divisors, whose sum is σ = 1021506131288. Its totient is φ = 1021506131286.

The previous prime is 1021506131257. The next prime is 1021506131363. The reversal of 1021506131287 is 7821316051201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021506131287 - 2⁷ = 1021506131159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021506131207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510753065643 + 510753065644.

It is an arithmetic number, because the mean of its divisors is an integer number (510753065644).

Almost surely, 2^{1021506131287} is an apocalyptic number.

1021506131287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021506131287 is an equidigital number, since it uses as much as digits as its factorization.

1021506131287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 1021506131287 in words is "one trillion, twenty-one billion, five hundred six million, one hundred thirty-one thousand, two hundred eighty-seven".