1204660021 has 4 divisors (see below), whose sum is σ = 1268063200. Its totient is φ = 1141256844.

The previous prime is 1204660013. The next prime is 1204660033. The reversal of 1204660021 is 1200664021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1200664021 = 47 ⋅25546043.

It is a cyclic number.

It is not a de Polignac number, because 1204660021 - 2³ = 1204660013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1204659974 and 1204660001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204660421) 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, 31701561 + ... + 31701598.

It is an arithmetic number, because the mean of its divisors is an integer number (317015800).

Almost surely, 2^1204660021 is an apocalyptic number.

It is an amenable number.

1204660021 is a deficient number, since it is larger than the sum of its proper divisors (63403179).

1204660021 is an equidigital number, since it uses as much as digits as its factorization.

1204660021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63403178.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1204660021 is about 34708.2125872249. The cubic root of 1204660021 is about 1064.0323511019.

The spelling of 1204660021 in words is "one billion, two hundred four million, six hundred sixty thousand, twenty-one".