2001821533 has 2 divisors, whose sum is σ = 2001821534. Its totient is φ = 2001821532.

The previous prime is 2001821489. The next prime is 2001821539. The reversal of 2001821533 is 3351281002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1954789369 + 47032164 = 44213^2 + 6858^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001821533 - 2⁹ = 2001821021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001821498 and 2001821507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001821539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000910766 + 1000910767.

It is an arithmetic number, because the mean of its divisors is an integer number (1000910767).

Almost surely, 2^2001821533 is an apocalyptic number.

It is an amenable number.

2001821533 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001821533 is an equidigital number, since it uses as much as digits as its factorization.

2001821533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2001821533 is about 44741.7202731410. The cubic root of 2001821533 is about 1260.3034317931.

The spelling of 2001821533 in words is "two billion, one million, eight hundred twenty-one thousand, five hundred thirty-three".