1021669487866 has 16 divisors (see below), whose sum is σ = 1571346241920. Its totient is φ = 497974012000.

The previous prime is 1021669487863. The next prime is 1021669487893. The reversal of 1021669487866 is 6687849661201.

It is a junction number, because it is equal to n+sod(n) for n = 1021669487798 and 1021669487807.

It is not an unprimeable number, because it can be changed into a prime (1021669487863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21627451 + ... + 21674638.

It is an arithmetic number, because the mean of its divisors is an integer number (98209140120).

Almost surely, 2^{1021669487866} is an apocalyptic number.

1021669487866 is a deficient number, since it is larger than the sum of its proper divisors (549676754054).

1021669487866 is a wasteful number, since it uses less digits than its factorization.

1021669487866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43302389.

The product of its (nonzero) digits is 41803776, while the sum is 64.

The spelling of 1021669487866 in words is "one trillion, twenty-one billion, six hundred sixty-nine million, four hundred eighty-seven thousand, eight hundred sixty-six".