21203323030 has 64 divisors (see below), whose sum is σ = 43367270400. Its totient is φ = 7420533120.

The previous prime is 21203323021. The next prime is 21203323039. The reversal of 21203323030 is 3032330212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21203323021) and next prime (21203323039).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 21203322989 and 21203323007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203323039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43075 + ... + 210385.

It is an arithmetic number, because the mean of its divisors is an integer number (677613600).

Almost surely, 2^21203323030 is an apocalyptic number.

21203323030 is an abundant number, since it is smaller than the sum of its proper divisors (22163947370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203323030 is a wasteful number, since it uses less digits than its factorization.

21203323030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167389.

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21203323030 its reverse (3032330212), we get a palindrome (24235653242).

The spelling of 21203323030 in words is "twenty-one billion, two hundred three million, three hundred twenty-three thousand, thirty".