20212898261 has 2 divisors, whose sum is σ = 20212898262. Its totient is φ = 20212898260.

The previous prime is 20212898257. The next prime is 20212898263. The reversal of 20212898261 is 16289821202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19563616900 + 649281361 = 139870^2 + 25481^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212898261 - 2² = 20212898257 is a prime.

It is a super-2 number, since 2×20212898261² (a number of 21 digits) contains 22 as substring.

Together with 20212898263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212898263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106449130 + 10106449131.

It is an arithmetic number, because the mean of its divisors is an integer number (10106449131).

Almost surely, 2^20212898261 is an apocalyptic number.

It is an amenable number.

20212898261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212898261 is an equidigital number, since it uses as much as digits as its factorization.

20212898261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 20212898261 in words is "twenty billion, two hundred twelve million, eight hundred ninety-eight thousand, two hundred sixty-one".