21012112120330 has 16 divisors (see below), whose sum is σ = 37838709233640. Its totient is φ = 8401087644352.

The previous prime is 21012112120247. The next prime is 21012112120343. The reversal of 21012112120330 is 3302121121012.

It can be written as a sum of positive squares in 4 ways, for example, as 19227181384161 + 1784930736169 = 4384881^2 + 1336013^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21012112120298 and 21012112120307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469626985 + ... + 469671724.

Almost surely, 2^{21012112120330} is an apocalyptic number.

21012112120330 is a deficient number, since it is larger than the sum of its proper divisors (16826597113310).

21012112120330 is a wasteful number, since it uses less digits than its factorization.

21012112120330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939300953.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21012112120330 its reverse (3302121121012), we get a palindrome (24314233241342).

The spelling of 21012112120330 in words is "twenty-one trillion, twelve billion, one hundred twelve million, one hundred twenty thousand, three hundred thirty".