21201022012073 has 2 divisors, whose sum is σ = 21201022012074. Its totient is φ = 21201022012072.

The previous prime is 21201022012033. The next prime is 21201022012111. The reversal of 21201022012073 is 37021022010212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21198169597609 + 2852414464 = 4604147^2 + 53408^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201022012073 - 2³⁸ = 20926144105129 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201022012033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600511006036 + 10600511006037.

It is an arithmetic number, because the mean of its divisors is an integer number (10600511006037).

Almost surely, 2^{21201022012073} is an apocalyptic number.

It is an amenable number.

21201022012073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201022012073 is an equidigital number, since it uses as much as digits as its factorization.

21201022012073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 21201022012073 its reverse (37021022010212), we get a palindrome (58222044022285).

The spelling of 21201022012073 in words is "twenty-one trillion, two hundred one billion, twenty-two million, twelve thousand, seventy-three".