1204040021 has 8 divisors (see below), whose sum is σ = 1227135744. Its totient is φ = 1181052720.

The previous prime is 1204039987. The next prime is 1204040039. The reversal of 1204040021 is 1200404021.

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

It is not a de Polignac number, because 1204040021 - 2¹⁴ = 1204023637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1204039978 and 1204040005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204040221) 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, 4505 + ... + 49278.

It is an arithmetic number, because the mean of its divisors is an integer number (153391968).

Almost surely, 2^1204040021 is an apocalyptic number.

It is an amenable number.

1204040021 is a deficient number, since it is larger than the sum of its proper divisors (23095723).

1204040021 is an equidigital number, since it uses as much as digits as its factorization.

1204040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54211.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1204040021 is about 34699.2798340254. The cubic root of 1204040021 is about 1063.8497786322.

Adding to 1204040021 its reverse (1200404021), we get a palindrome (2404444042).

The spelling of 1204040021 in words is "one billion, two hundred four million, forty thousand, twenty-one".