21220001210101 has 2 divisors, whose sum is σ = 21220001210102. Its totient is φ = 21220001210100.

The previous prime is 21220001210047. The next prime is 21220001210143. The reversal of 21220001210101 is 10101210002212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20476484759025 + 743516451076 = 4525095^2 + 862274^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220001210101 - 2¹¹ = 21220001208053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220001210171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610000605050 + 10610000605051.

It is an arithmetic number, because the mean of its divisors is an integer number (10610000605051).

Almost surely, 2^{21220001210101} is an apocalyptic number.

It is an amenable number.

21220001210101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220001210101 is an equidigital number, since it uses as much as digits as its factorization.

21220001210101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21220001210101 its reverse (10101210002212), we get a palindrome (31321211212313).

The spelling of 21220001210101 in words is "twenty-one trillion, two hundred twenty billion, one million, two hundred ten thousand, one hundred one".