21221122222001 has 32 divisors (see below), whose sum is σ = 24460958148480. Its totient is φ = 18245858342400.

The previous prime is 21221122221913. The next prime is 21221122222019. The reversal of 21221122222001 is 10022222112212.

It is not a de Polignac number, because 21221122222001 - 2¹⁸ = 21221121959857 is a prime.

It is a super-2 number, since 2×21221122222001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21221122228001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35761046 + ... + 36349616.

It is an arithmetic number, because the mean of its divisors is an integer number (764404942140).

Almost surely, 2^{21221122222001} is an apocalyptic number.

It is an amenable number.

21221122222001 is a deficient number, since it is larger than the sum of its proper divisors (3239835926479).

21221122222001 is a wasteful number, since it uses less digits than its factorization.

21221122222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591057.

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

Adding to 21221122222001 its reverse (10022222112212), we get a palindrome (31243344334213).

The spelling of 21221122222001 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, one".