1021681510951 has 2 divisors, whose sum is σ = 1021681510952. Its totient is φ = 1021681510950.

The previous prime is 1021681510909. The next prime is 1021681511107. The reversal of 1021681510951 is 1590151861201.

It is a weak prime.

It is an emirp because it is prime and its reverse (1590151861201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021681510951 - 2³⁵ = 987321772583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021681510151) 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, 510840755475 + 510840755476.

It is an arithmetic number, because the mean of its divisors is an integer number (510840755476).

Almost surely, 2^{1021681510951} is an apocalyptic number.

1021681510951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021681510951 is an equidigital number, since it uses as much as digits as its factorization.

1021681510951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 40.

The spelling of 1021681510951 in words is "one trillion, twenty-one billion, six hundred eighty-one million, five hundred ten thousand, nine hundred fifty-one".