21000033330 has 32 divisors (see below), whose sum is σ = 52025891328. Its totient is φ = 5419363200.

The previous prime is 21000033289. The next prime is 21000033389. The reversal of 21000033330 is 3333000012.

It is a super-2 number, since 2×21000033330² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

21000033330 is a modest number, since divided by 33330 gives 210 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11289411 + ... + 11291270.

It is an arithmetic number, because the mean of its divisors is an integer number (1625809104).

Almost surely, 2^21000033330 is an apocalyptic number.

21000033330 is an abundant number, since it is smaller than the sum of its proper divisors (31025857998).

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

21000033330 is a wasteful number, since it uses less digits than its factorization.

21000033330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22580722.

The product of its (nonzero) digits is 162, while the sum is 15.

Adding to 21000033330 its reverse (3333000012), we get a palindrome (24333033342).

The spelling of 21000033330 in words is "twenty-one billion, thirty-three thousand, three hundred thirty".