1021601043 has 24 divisors (see below), whose sum is σ = 1604685888. Its totient is φ = 623676672.

The previous prime is 1021601039. The next prime is 1021601047. The reversal of 1021601043 is 3401061201.

It is a happy number.

1021601043 is a `hidden beast` number, since 1 + 0 + 21 + 601 + 0 + 43 = 666.

1021601043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1021601039) and next prime (1021601047).

It is not a de Polignac number, because 1021601043 - 2² = 1021601039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021601047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84571 + ... + 95892.

It is an arithmetic number, because the mean of its divisors is an integer number (66861912).

Almost surely, 2^1021601043 is an apocalyptic number.

1021601043 is a deficient number, since it is larger than the sum of its proper divisors (583084845).

1021601043 is a wasteful number, since it uses less digits than its factorization.

1021601043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180523 (or 180520 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1021601043 is about 31962.4943175591. The cubic root of 1021601043 is about 1007.1491160102.

Adding to 1021601043 its reverse (3401061201), we get a palindrome (4422662244).

The spelling of 1021601043 in words is "one billion, twenty-one million, six hundred one thousand, forty-three".