102406021687 has 2 divisors, whose sum is σ = 102406021688. Its totient is φ = 102406021686.

The previous prime is 102406021607. The next prime is 102406021699. The reversal of 102406021687 is 786120604201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102406021687 - 2⁷ = 102406021559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102406021607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51203010843 + 51203010844.

It is an arithmetic number, because the mean of its divisors is an integer number (51203010844).

Almost surely, 2^102406021687 is an apocalyptic number.

102406021687 is a deficient number, since it is larger than the sum of its proper divisors (1).

102406021687 is an equidigital number, since it uses as much as digits as its factorization.

102406021687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

Adding to 102406021687 its reverse (786120604201), we get a palindrome (888526625888).

The spelling of 102406021687 in words is "one hundred two billion, four hundred six million, twenty-one thousand, six hundred eighty-seven".