1230001021 has 4 divisors (see below), whose sum is σ = 1231152700. Its totient is φ = 1228849344.

The previous prime is 1230001009. The next prime is 1230001033. The reversal of 1230001021 is 1201000321.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1230001009) and next prime (1230001033).

It can be written as a sum of positive squares in 2 ways, for example, as 917241796 + 312759225 = 30286^2 + 17685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230001021 - 2²¹ = 1227903869 is a prime.

It is a super-2 number, since 2×1230001021² = 3025805023322084882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1230000989 and 1230001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230001001) 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, 574236 + ... + 576373.

It is an arithmetic number, because the mean of its divisors is an integer number (307788175).

Almost surely, 2^1230001021 is an apocalyptic number.

It is an amenable number.

1230001021 is a deficient number, since it is larger than the sum of its proper divisors (1151679).

1230001021 is a wasteful number, since it uses less digits than its factorization.

1230001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151678.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1230001021 is about 35071.3703895357. The cubic root of 1230001021 is about 1071.4415661518.

Adding to 1230001021 its reverse (1201000321), we get a palindrome (2431001342).

The spelling of 1230001021 in words is "one billion, two hundred thirty million, one thousand, twenty-one".