1621042430 has 16 divisors (see below), whose sum is σ = 3334716000. Its totient is φ = 555785952.

The previous prime is 1621042411. The next prime is 1621042433. The reversal of 1621042430 is 342401261.

It is a junction number, because it is equal to n+sod(n) for n = 1621042396 and 1621042405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621042433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11578805 + ... + 11578944.

It is an arithmetic number, because the mean of its divisors is an integer number (208419750).

Almost surely, 2^1621042430 is an apocalyptic number.

1621042430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1621042430 is an abundant number, since it is smaller than the sum of its proper divisors (1713673570).

1621042430 is a wasteful number, since it uses less digits than its factorization.

1621042430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23157763.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1621042430 is about 40262.1712032523. The cubic root of 1621042430 is about 1174.7121504033.

Adding to 1621042430 its reverse (342401261), we get a palindrome (1963443691).

The spelling of 1621042430 in words is "one billion, six hundred twenty-one million, forty-two thousand, four hundred thirty".