21221001201167 has 2 divisors, whose sum is σ = 21221001201168. Its totient is φ = 21221001201166.

The previous prime is 21221001201053. The next prime is 21221001201223. The reversal of 21221001201167 is 76110210012212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221001201167 - 2¹⁴ = 21221001184783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221001200167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610500600583 + 10610500600584.

It is an arithmetic number, because the mean of its divisors is an integer number (10610500600584).

Almost surely, 2^{21221001201167} is an apocalyptic number.

21221001201167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221001201167 is an equidigital number, since it uses as much as digits as its factorization.

21221001201167 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 26.

Adding to 21221001201167 its reverse (76110210012212), we get a palindrome (97331211213379).

The spelling of 21221001201167 in words is "twenty-one trillion, two hundred twenty-one billion, one million, two hundred one thousand, one hundred sixty-seven".