21221001110077 has 2 divisors, whose sum is σ = 21221001110078. Its totient is φ = 21221001110076.

The previous prime is 21221001110069. The next prime is 21221001110203. The reversal of 21221001110077 is 77001110012212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20823469599076 + 397531511001 = 4563274^2 + 630501^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221001110077 - 2³ = 21221001110069 is a prime.

It is a super-2 number, since 2×21221001110077² (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 (21221001111077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610500555038 + 10610500555039.

It is an arithmetic number, because the mean of its divisors is an integer number (10610500555039).

Almost surely, 2^{21221001110077} is an apocalyptic number.

It is an amenable number.

21221001110077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221001110077 is an equidigital number, since it uses as much as digits as its factorization.

21221001110077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 25.

Adding to 21221001110077 its reverse (77001110012212), we get a palindrome (98222111122289).

The spelling of 21221001110077 in words is "twenty-one trillion, two hundred twenty-one billion, one million, one hundred ten thousand, seventy-seven".