4200621021 has 24 divisors (see below), whose sum is σ = 6141615480. Its totient is φ = 2766297600.

The previous prime is 4200621017. The next prime is 4200621059. The reversal of 4200621021 is 1201260024.

4200621021 is a `hidden beast` number, since 4 + 20 + 0 + 621 + 0 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 93605625 + 4107015396 = 9675^2 + 64086^2 .

It is not a de Polignac number, because 4200621021 - 2² = 4200621017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4200620985 and 4200621003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4200621121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1184511 + ... + 1188051.

It is an arithmetic number, because the mean of its divisors is an integer number (255900645).

Almost surely, 2^4200621021 is an apocalyptic number.

It is an amenable number.

4200621021 is a deficient number, since it is larger than the sum of its proper divisors (1940994459).

4200621021 is a wasteful number, since it uses less digits than its factorization.

4200621021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5117 (or 5114 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4200621021 is about 64812.1980880143. The cubic root of 4200621021 is about 1613.5081637778.

Adding to 4200621021 its reverse (1201260024), we get a palindrome (5401881045).

The spelling of 4200621021 in words is "four billion, two hundred million, six hundred twenty-one thousand, twenty-one".