21212011021277 has 2 divisors, whose sum is σ = 21212011021278. Its totient is φ = 21212011021276.

The previous prime is 21212011021259. The next prime is 21212011021363. The reversal of 21212011021277 is 77212011021212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18097417859236 + 3114593162041 = 4254106^2 + 1764821^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212011021277 - 2²⁰ = 21212009972701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212011021577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606005510638 + 10606005510639.

It is an arithmetic number, because the mean of its divisors is an integer number (10606005510639).

Almost surely, 2^{21212011021277} is an apocalyptic number.

It is an amenable number.

21212011021277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212011021277 is an equidigital number, since it uses as much as digits as its factorization.

21212011021277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 29.

Adding to 21212011021277 its reverse (77212011021212), we get a palindrome (98424022042489).

The spelling of 21212011021277 in words is "twenty-one trillion, two hundred twelve billion, eleven million, twenty-one thousand, two hundred seventy-seven".