21012230343077 has 2 divisors, whose sum is σ = 21012230343078. Its totient is φ = 21012230343076.

The previous prime is 21012230343037. The next prime is 21012230343109. The reversal of 21012230343077 is 77034303221012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18438384472036 + 2573845871041 = 4293994^2 + 1604321^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012230343077 - 2¹⁰ = 21012230342053 is a prime.

It is a super-2 number, since 2×21012230343077² (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 (21012230343037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506115171538 + 10506115171539.

It is an arithmetic number, because the mean of its divisors is an integer number (10506115171539).

Almost surely, 2^{21012230343077} is an apocalyptic number.

It is an amenable number.

21012230343077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012230343077 is an equidigital number, since it uses as much as digits as its factorization.

21012230343077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 35.

Adding to 21012230343077 its reverse (77034303221012), we get a palindrome (98046533564089).

The spelling of 21012230343077 in words is "twenty-one trillion, twelve billion, two hundred thirty million, three hundred forty-three thousand, seventy-seven".