21121020212204 has 48 divisors (see below), whose sum is σ = 41332081140000. Its totient is φ = 9360258163200.

The previous prime is 21121020212197. The next prime is 21121020212213. The reversal of 21121020212204 is 40221202012112.

It is a happy number.

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, 984779 + ... + 6573570.

It is an arithmetic number, because the mean of its divisors is an integer number (861085023750).

Almost surely, 2^{21121020212204} is an apocalyptic number.

It is an amenable number.

21121020212204 is a deficient number, since it is larger than the sum of its proper divisors (20211060927796).

21121020212204 is a wasteful number, since it uses less digits than its factorization.

21121020212204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7559954 (or 7559952 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21121020212204 its reverse (40221202012112), we get a palindrome (61342222224316).

The spelling of 21121020212204 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twelve thousand, two hundred four".