21203333130 has 128 divisors (see below), whose sum is σ = 61745172480. Its totient is φ = 4549063680.

The previous prime is 21203333083. The next prime is 21203333131. The reversal of 21203333130 is 3133330212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21203333097 and 21203333106.

It is not an unprimeable number, because it can be changed into a prime (21203333131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1345195 + ... + 1360865.

It is an arithmetic number, because the mean of its divisors is an integer number (482384160).

Almost surely, 2^21203333130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203333130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30872586240).

21203333130 is an abundant number, since it is smaller than the sum of its proper divisors (40541839350).

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

21203333130 is a wasteful number, since it uses less digits than its factorization.

21203333130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16084.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21203333130 its reverse (3133330212), we get a palindrome (24336663342).

The spelling of 21203333130 in words is "twenty-one billion, two hundred three million, three hundred thirty-three thousand, one hundred thirty".