1021678617490 has 8 divisors (see below), whose sum is σ = 1839021511500. Its totient is φ = 408671446992.

The previous prime is 1021678617473. The next prime is 1021678617497. The reversal of 1021678617490 is 947168761201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1021613541001 + 65076489 = 1010749^2 + 8067^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1021678617497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51083930865 + ... + 51083930884.

Almost surely, 2^{1021678617490} is an apocalyptic number.

1021678617490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021678617490 is a deficient number, since it is larger than the sum of its proper divisors (817342894010).

1021678617490 is a wasteful number, since it uses less digits than its factorization.

1021678617490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102167861756.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 1021678617490 in words is "one trillion, twenty-one billion, six hundred seventy-eight million, six hundred seventeen thousand, four hundred ninety".