21222012021157 has 2 divisors, whose sum is σ = 21222012021158. Its totient is φ = 21222012021156.

The previous prime is 21222012021139. The next prime is 21222012021191. The reversal of 21222012021157 is 75112021022212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20292781572001 + 929230449156 = 4504751^2 + 963966^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222012021157 - 2⁷ = 21222012021029 is a prime.

It is a super-2 number, since 2×21222012021157² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222012021557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611006010578 + 10611006010579.

It is an arithmetic number, because the mean of its divisors is an integer number (10611006010579).

Almost surely, 2^{21222012021157} is an apocalyptic number.

It is an amenable number.

21222012021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222012021157 is an equidigital number, since it uses as much as digits as its factorization.

21222012021157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 21222012021157 its reverse (75112021022212), we get a palindrome (96334033043369).

The spelling of 21222012021157 in words is "twenty-one trillion, two hundred twenty-two billion, twelve million, twenty-one thousand, one hundred fifty-seven".