21201222210073 has 2 divisors, whose sum is σ = 21201222210074. Its totient is φ = 21201222210072.

The previous prime is 21201222210061. The next prime is 21201222210101. The reversal of 21201222210073 is 37001222210212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21146413781529 + 54808428544 = 4598523^2 + 234112^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201222210073 - 2³⁷ = 21063783256601 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201222510073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600611105036 + 10600611105037.

It is an arithmetic number, because the mean of its divisors is an integer number (10600611105037).

Almost surely, 2^{21201222210073} is an apocalyptic number.

It is an amenable number.

21201222210073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201222210073 is an equidigital number, since it uses as much as digits as its factorization.

21201222210073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 21201222210073 its reverse (37001222210212), we get a palindrome (58202444420285).

The spelling of 21201222210073 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred ten thousand, seventy-three".