21203021330 has 32 divisors (see below), whose sum is σ = 39415223808. Its totient is φ = 8203737600.

The previous prime is 21203021321. The next prime is 21203021351. The reversal of 21203021330 is 3312030212.

It is a super-2 number, since 2×21203021330² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21203021299 and 21203021308.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 689585 + ... + 719675.

It is an arithmetic number, because the mean of its divisors is an integer number (1231725744).

Almost surely, 2^21203021330 is an apocalyptic number.

21203021330 is a deficient number, since it is larger than the sum of its proper divisors (18212202478).

21203021330 is a wasteful number, since it uses less digits than its factorization.

21203021330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32402.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21203021330 its reverse (3312030212), we get a palindrome (24515051542).

The spelling of 21203021330 in words is "twenty-one billion, two hundred three million, twenty-one thousand, three hundred thirty".