1021701660989 has 4 divisors (see below), whose sum is σ = 1075475432640. Its totient is φ = 967927889340.

The previous prime is 1021701660983. The next prime is 1021701661009. The reversal of 1021701660989 is 9890661071201.

1021701660989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021701660989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021701660983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26886885797 + ... + 26886885834.

It is an arithmetic number, because the mean of its divisors is an integer number (268868858160).

Almost surely, 2^{1021701660989} is an apocalyptic number.

1021701660989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1021701660989 is a deficient number, since it is larger than the sum of its proper divisors (53773771651).

1021701660989 is an equidigital number, since it uses as much as digits as its factorization.

1021701660989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53773771650.

The product of its (nonzero) digits is 326592, while the sum is 50.

The spelling of 1021701660989 in words is "one trillion, twenty-one billion, seven hundred one million, six hundred sixty thousand, nine hundred eighty-nine".