4537001821 has 16 divisors (see below), whose sum is σ = 5101363008. Its totient is φ = 3999196800.

The previous prime is 4537001801. The next prime is 4537001851. The reversal of 4537001821 is 1281007354.

It is a cyclic number.

It is not a de Polignac number, because 4537001821 - 2⁵ = 4537001789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4537001801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42655 + ... + 104371.

It is an arithmetic number, because the mean of its divisors is an integer number (318835188).

Almost surely, 2^4537001821 is an apocalyptic number.

4537001821 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4537001821 is a deficient number, since it is larger than the sum of its proper divisors (564361187).

4537001821 is a wasteful number, since it uses less digits than its factorization.

4537001821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61932.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 4537001821 is about 67357.2699936688. The cubic root of 4537001821 is about 1655.4763640615.

It can be divided in two parts, 45370018 and 21, that multiplied together give a triangular number (952770378 = T₄₃₆₅₂).

The spelling of 4537001821 in words is "four billion, five hundred thirty-seven million, one thousand, eight hundred twenty-one".