21032021331 has 64 divisors (see below), whose sum is σ = 32503726080. Its totient is φ = 13426560000.

The previous prime is 21032021317. The next prime is 21032021347. The reversal of 21032021331 is 13312023012.

21032021331 is a `hidden beast` number, since 2 + 10 + 320 + 2 + 1 + 331 = 666.

It is not a de Polignac number, because 21032021331 - 2¹⁴ = 21032004947 is a prime.

It is a super-2 number, since 2×21032021331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21032021531) 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 63 ways as a sum of consecutive naturals, for example, 52448731 + ... + 52449131.

It is an arithmetic number, because the mean of its divisors is an integer number (507870720).

Almost surely, 2^21032021331 is an apocalyptic number.

21032021331 is a deficient number, since it is larger than the sum of its proper divisors (11471704749).

21032021331 is a wasteful number, since it uses less digits than its factorization.

21032021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21032021331 its reverse (13312023012), we get a palindrome (34344044343).

The spelling of 21032021331 in words is "twenty-one billion, thirty-two million, twenty-one thousand, three hundred thirty-one".