21220101220001 has 2 divisors, whose sum is σ = 21220101220002. Its totient is φ = 21220101220000.

The previous prime is 21220101219973. The next prime is 21220101220009. The reversal of 21220101220001 is 10002210102212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11520763350625 + 9699337869376 = 3394225^2 + 3114376^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220101220001 - 2²² = 21220097025697 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220101220009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610050610000 + 10610050610001.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050610001).

Almost surely, 2^{21220101220001} is an apocalyptic number.

It is an amenable number.

21220101220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220101220001 is an equidigital number, since it uses as much as digits as its factorization.

21220101220001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220101220001 its reverse (10002210102212), we get a palindrome (31222311322213).

The spelling of 21220101220001 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twenty thousand, one".