1204421021 has 8 divisors (see below), whose sum is σ = 1243678464. Its totient is φ = 1165188960.

The previous prime is 1204420969. The next prime is 1204421041. The reversal of 1204421021 is 1201244021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1204421021 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 (1204421041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158321 + ... + 165753.

It is an arithmetic number, because the mean of its divisors is an integer number (155459808).

Almost surely, 2^1204421021 is an apocalyptic number.

It is an amenable number.

1204421021 is a deficient number, since it is larger than the sum of its proper divisors (39257443).

1204421021 is an equidigital number, since it uses as much as digits as its factorization.

1204421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12691.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1204421021 is about 34704.7694272704. The cubic root of 1204421021 is about 1063.9619797808.

Adding to 1204421021 its reverse (1201244021), we get a palindrome (2405665042).

The spelling of 1204421021 in words is "one billion, two hundred four million, four hundred twenty-one thousand, twenty-one".