21221122211201 has 8 divisors (see below), whose sum is σ = 23948601868800. Its totient is φ = 18626690341840.

The previous prime is 21221122211173. The next prime is 21221122211213. The reversal of 21221122211201 is 10211222112212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21221122211201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221122211251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33261946721 + ... + 33261947358.

It is an arithmetic number, because the mean of its divisors is an integer number (2993575233600).

Almost surely, 2^{21221122211201} is an apocalyptic number.

It is an amenable number.

21221122211201 is a deficient number, since it is larger than the sum of its proper divisors (2727479657599).

21221122211201 is a wasteful number, since it uses less digits than its factorization.

21221122211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66523894119.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21221122211201 its reverse (10211222112212), we get a palindrome (31432344323413).

The spelling of 21221122211201 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, two hundred one".