21235333830 has 32 divisors (see below), whose sum is σ = 51469410528. Its totient is φ = 5606688000.

The previous prime is 21235333829. The next prime is 21235333841. The reversal of 21235333830 is 3833353212.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21235333791 and 21235333800.

It is a congruent number.

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, 3501151 + ... + 3507210.

It is an arithmetic number, because the mean of its divisors is an integer number (1608419079).

Almost surely, 2^21235333830 is an apocalyptic number.

21235333830 is an abundant number, since it is smaller than the sum of its proper divisors (30234076698).

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

21235333830 is a wasteful number, since it uses less digits than its factorization.

21235333830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7008472.

The product of its (nonzero) digits is 38880, while the sum is 33.

The spelling of 21235333830 in words is "twenty-one billion, two hundred thirty-five million, three hundred thirty-three thousand, eight hundred thirty".