21011222149 has 2 divisors, whose sum is σ = 21011222150. Its totient is φ = 21011222148.

The previous prime is 21011222101. The next prime is 21011222159. The reversal of 21011222149 is 94122211012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14428333924 + 6582888225 = 120118^2 + 81135^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011222149 - 2¹³ = 21011213957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011222159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505611074 + 10505611075.

It is an arithmetic number, because the mean of its divisors is an integer number (10505611075).

Almost surely, 2^21011222149 is an apocalyptic number.

It is an amenable number.

21011222149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011222149 is an equidigital number, since it uses as much as digits as its factorization.

21011222149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21011222149 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, one hundred forty-nine".