21201221012234 has 32 divisors (see below), whose sum is σ = 33527120909760. Its totient is φ = 10027233216000.

The previous prime is 21201221012233. The next prime is 21201221012273. The reversal of 21201221012234 is 43221012210212.

It is not an unprimeable number, because it can be changed into a prime (21201221012233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 519604634 + ... + 519645434.

It is an arithmetic number, because the mean of its divisors is an integer number (1047722528430).

Almost surely, 2^{21201221012234} is an apocalyptic number.

21201221012234 is a deficient number, since it is larger than the sum of its proper divisors (12325899897526).

21201221012234 is a wasteful number, since it uses less digits than its factorization.

21201221012234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61526.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21201221012234 its reverse (43221012210212), we get a palindrome (64422233222446).

The spelling of 21201221012234 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-one million, twelve thousand, two hundred thirty-four".