1234660021 has 4 divisors (see below), whose sum is σ = 1411040032. Its totient is φ = 1058280012.

The previous prime is 1234660001. The next prime is 1234660039. The reversal of 1234660021 is 1200664321.

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 not a de Polignac number, because 1234660021 - 2⁷ = 1234659893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234660001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88189995 + ... + 88190008.

It is an arithmetic number, because the mean of its divisors is an integer number (352760008).

Almost surely, 2^1234660021 is an apocalyptic number.

It is an amenable number.

1234660021 is a deficient number, since it is larger than the sum of its proper divisors (176380011).

1234660021 is an equidigital number, since it uses as much as digits as its factorization.

1234660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176380010.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1234660021 is about 35137.7293091059. The cubic root of 1234660021 is about 1072.7926644282.

The spelling of 1234660021 in words is "one billion, two hundred thirty-four million, six hundred sixty thousand, twenty-one".