1621226204 has 12 divisors (see below), whose sum is σ = 3055387944. Its totient is φ = 748258224.

The previous prime is 1621226171. The next prime is 1621226207. The reversal of 1621226204 is 4026221261.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621226207) 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, 15588662 + ... + 15588765.

It is an arithmetic number, because the mean of its divisors is an integer number (254615662).

Almost surely, 2^1621226204 is an apocalyptic number.

It is an amenable number.

1621226204 is a deficient number, since it is larger than the sum of its proper divisors (1434161740).

1621226204 is a wasteful number, since it uses less digits than its factorization.

1621226204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31177444 (or 31177442 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1621226204 is about 40264.4533552860. The cubic root of 1621226204 is about 1174.7565402332.

Adding to 1621226204 its reverse (4026221261), we get a palindrome (5647447465).

The spelling of 1621226204 in words is "one billion, six hundred twenty-one million, two hundred twenty-six thousand, two hundred four".