21121110330 has 32 divisors (see below), whose sum is σ = 50713648128. Its totient is φ = 5629742400.

The previous prime is 21121110319. The next prime is 21121110349. The reversal of 21121110330 is 3301112112.

It is a happy number.

It is a super-2 number, since 2×21121110330² (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).

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, 91866 + ... + 225125.

It is an arithmetic number, because the mean of its divisors is an integer number (1584801504).

Almost surely, 2^21121110330 is an apocalyptic number.

21121110330 is an abundant number, since it is smaller than the sum of its proper divisors (29592537798).

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

21121110330 is a wasteful number, since it uses less digits than its factorization.

21121110330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319222.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21121110330 its reverse (3301112112), we get a palindrome (24422222442).

The spelling of 21121110330 in words is "twenty-one billion, one hundred twenty-one million, one hundred ten thousand, three hundred thirty".