21201022224101 has 2 divisors, whose sum is σ = 21201022224102. Its totient is φ = 21201022224100.

The previous prime is 21201022224097. The next prime is 21201022224127. The reversal of 21201022224101 is 10142222010212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16077132736900 + 5123889487201 = 4009630^2 + 2263601^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201022224101 - 2² = 21201022224097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201022224181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600511112050 + 10600511112051.

It is an arithmetic number, because the mean of its divisors is an integer number (10600511112051).

Almost surely, 2^{21201022224101} is an apocalyptic number.

It is an amenable number.

21201022224101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201022224101 is an equidigital number, since it uses as much as digits as its factorization.

21201022224101 is an evil number, because the sum of its binary digits is even.

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

Adding to 21201022224101 its reverse (10142222010212), we get a palindrome (31343244234313).

The spelling of 21201022224101 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred twenty-four thousand, one hundred one".