21120121203330 has 64 divisors (see below), whose sum is σ = 51169601283840. Its totient is φ = 5578803879936.

The previous prime is 21120121203299. The next prime is 21120121203341. The reversal of 21120121203330 is 3330212102112.

It is a junction number, because it is equal to n+sod(n) for n = 21120121203297 and 21120121203306.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6478590 + ... + 9176729.

It is an arithmetic number, because the mean of its divisors is an integer number (799525020060).

Almost surely, 2^{21120121203330} is an apocalyptic number.

21120121203330 is an abundant number, since it is smaller than the sum of its proper divisors (30049480080510).

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

21120121203330 is a wasteful number, since it uses less digits than its factorization.

21120121203330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15655755.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21120121203330 its reverse (3330212102112), we get a palindrome (24450333305442).

The spelling of 21120121203330 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-one million, two hundred three thousand, three hundred thirty".