21011221022149 has 2 divisors, whose sum is σ = 21011221022150. Its totient is φ = 21011221022148.

The previous prime is 21011221022111. The next prime is 21011221022189. The reversal of 21011221022149 is 94122012211012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13195383177025 + 7815837845124 = 3632545^2 + 2795682^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011221022149 - 2⁴¹ = 18812197766597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011221022189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505610511074 + 10505610511075.

It is an arithmetic number, because the mean of its divisors is an integer number (10505610511075).

Almost surely, 2^{21011221022149} is an apocalyptic number.

It is an amenable number.

21011221022149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011221022149 is an equidigital number, since it uses as much as digits as its factorization.

21011221022149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 21011221022149 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, twenty-two thousand, one hundred forty-nine".