21112121330 has 16 divisors (see below), whose sum is σ = 40237219800. Its totient is φ = 7948092672.

The previous prime is 21112121269. The next prime is 21112121351. The reversal of 21112121330 is 3312121112.

It can be written as a sum of positive squares in 4 ways, for example, as 21027610081 + 84511249 = 145009^2 + 9193^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21112121299 and 21112121308.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62094305 + ... + 62094644.

Almost surely, 2^21112121330 is an apocalyptic number.

21112121330 is a deficient number, since it is larger than the sum of its proper divisors (19125098470).

21112121330 is a wasteful number, since it uses less digits than its factorization.

21112121330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124188973.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21112121330 its reverse (3312121112), we get a palindrome (24424242442).

The spelling of 21112121330 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, three hundred thirty".