1233421021 has 4 divisors (see below), whose sum is σ = 1409624032. Its totient is φ = 1057218012.

The previous prime is 1233420997. The next prime is 1233421051. The reversal of 1233421021 is 1201243321.

It is a happy number.

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 1233421021 - 2⁷ = 1233420893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1233421021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233421051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88101495 + ... + 88101508.

It is an arithmetic number, because the mean of its divisors is an integer number (352406008).

Almost surely, 2^1233421021 is an apocalyptic number.

It is an amenable number.

1233421021 is a deficient number, since it is larger than the sum of its proper divisors (176203011).

1233421021 is an equidigital number, since it uses as much as digits as its factorization.

1233421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176203010.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1233421021 is about 35120.0942624020. The cubic root of 1233421021 is about 1072.4336897692.

Adding to 1233421021 its reverse (1201243321), we get a palindrome (2434664342).

The spelling of 1233421021 in words is "one billion, two hundred thirty-three million, four hundred twenty-one thousand, twenty-one".