21111221222201 has 16 divisors (see below), whose sum is σ = 23037279422400. Its totient is φ = 19186306681920.

The previous prime is 21111221222153. The next prime is 21111221222407. The reversal of 21111221222201 is 10222212211112.

It is a cyclic number.

It is not a de Polignac number, because 21111221222201 - 2²² = 21111217027897 is a prime.

It is a super-2 number, since 2×21111221222201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111221212201) 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, 682113875 + ... + 682144823.

It is an arithmetic number, because the mean of its divisors is an integer number (1439829963900).

Almost surely, 2^{21111221222201} is an apocalyptic number.

It is an amenable number.

21111221222201 is a deficient number, since it is larger than the sum of its proper divisors (1926058200199).

21111221222201 is a wasteful number, since it uses less digits than its factorization.

21111221222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47416.

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

Adding to 21111221222201 its reverse (10222212211112), we get a palindrome (31333433433313).

The spelling of 21111221222201 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred one".