21121110222001 has 32 divisors (see below), whose sum is σ = 23460852400128. Its totient is φ = 18912575996160.

The previous prime is 21121110221993. The next prime is 21121110222059. The reversal of 21121110222001 is 10022201112112.

It is a cyclic number.

It is not a de Polignac number, because 21121110222001 - 2³ = 21121110221993 is a prime.

It is a super-2 number, since 2×21121110222001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121110922001) 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, 1086076060 + ... + 1086095506.

It is an arithmetic number, because the mean of its divisors is an integer number (733151637504).

Almost surely, 2^{21121110222001} is an apocalyptic number.

It is an amenable number.

21121110222001 is a deficient number, since it is larger than the sum of its proper divisors (2339742178127).

21121110222001 is a wasteful number, since it uses less digits than its factorization.

21121110222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34221.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121110222001 its reverse (10022201112112), we get a palindrome (31143311334113).

The spelling of 21121110222001 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred twenty-two thousand, one".