4021621550 has 24 divisors (see below), whose sum is σ = 7492718352. Its totient is φ = 1605960000.

The previous prime is 4021621519. The next prime is 4021621561. The reversal of 4021621550 is 551261204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36866 + ... + 96965.

It is an arithmetic number, because the mean of its divisors is an integer number (312196598).

Almost surely, 2^4021621550 is an apocalyptic number.

4021621550 is a deficient number, since it is larger than the sum of its proper divisors (3471096802).

4021621550 is a wasteful number, since it uses less digits than its factorization.

4021621550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134444 (or 134439 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 4021621550 is about 63416.2561966567. The cubic root of 4021621550 is about 1590.2560865426.

Adding to 4021621550 its reverse (551261204), we get a palindrome (4572882754).

The spelling of 4021621550 in words is "four billion, twenty-one million, six hundred twenty-one thousand, five hundred fifty".