21012221330 has 32 divisors (see below), whose sum is σ = 38904357888. Its totient is φ = 8166412800.

The previous prime is 21012221327. The next prime is 21012221381. The reversal of 21012221330 is 3312221012.

It is a junction number, because it is equal to n+sod(n) for n = 21012221299 and 21012221308.

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, 45791 + ... + 210050.

It is an arithmetic number, because the mean of its divisors is an integer number (1215761184).

Almost surely, 2^21012221330 is an apocalyptic number.

21012221330 is a deficient number, since it is larger than the sum of its proper divisors (17892136558).

21012221330 is a wasteful number, since it uses less digits than its factorization.

21012221330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256082.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21012221330 its reverse (3312221012), we get a palindrome (24324442342).

The spelling of 21012221330 in words is "twenty-one billion, twelve million, two hundred twenty-one thousand, three hundred thirty".