21221104334121 has 12 divisors (see below), whose sum is σ = 30669726109620. Its totient is φ = 14139547574400.

The previous prime is 21221104334107. The next prime is 21221104334137. The reversal of 21221104334121 is 12143340112212.

21221104334121 is a `hidden beast` number, since 2 + 1 + 2 + 211 + 0 + 4 + 33 + 412 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9995682944025 + 11225421390096 = 3161595^2 + 3350436^2 .

It is not a de Polignac number, because 21221104334121 - 2⁶ = 21221104334057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221104334621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 654592476 + ... + 654624893.

It is an arithmetic number, because the mean of its divisors is an integer number (2555810509135).

Almost surely, 2^{21221104334121} is an apocalyptic number.

It is an amenable number.

21221104334121 is a deficient number, since it is larger than the sum of its proper divisors (9448621775499).

21221104334121 is a wasteful number, since it uses less digits than its factorization.

21221104334121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309219176 (or 1309219173 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 21221104334121 its reverse (12143340112212), we get a palindrome (33364444446333).

The spelling of 21221104334121 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred four million, three hundred thirty-four thousand, one hundred twenty-one".