4021356021 has 8 divisors (see below), whose sum is σ = 5546698080. Its totient is φ = 2588458992.

The previous prime is 4021356019. The next prime is 4021356113. The reversal of 4021356021 is 1206531204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4021356021 - 2¹ = 4021356019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4021355982 and 4021356000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021356121) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23111155 + ... + 23111328.

It is an arithmetic number, because the mean of its divisors is an integer number (693337260).

Almost surely, 2^4021356021 is an apocalyptic number.

It is an amenable number.

4021356021 is a deficient number, since it is larger than the sum of its proper divisors (1525342059).

4021356021 is a wasteful number, since it uses less digits than its factorization.

4021356021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46222515.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 4021356021 is about 63414.1626216100. The cubic root of 4021356021 is about 1590.2210866968.

Adding to 4021356021 its reverse (1206531204), we get a palindrome (5227887225).

It can be divided in two parts, 402135 and 6021, that added together give a triangular number (408156 = T₉₀₃).

The spelling of 4021356021 in words is "four billion, twenty-one million, three hundred fifty-six thousand, twenty-one".