21471048149 has 2 divisors, whose sum is σ = 21471048150. Its totient is φ = 21471048148.

The previous prime is 21471048139. The next prime is 21471048169. The reversal of 21471048149 is 94184017412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20751843025 + 719205124 = 144055^2 + 26818^2 .

It is a cyclic number.

It is not a de Polignac number, because 21471048149 - 2¹⁶ = 21470982613 is a prime.

It is a super-2 number, since 2×21471048149² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21471048119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735524074 + 10735524075.

It is an arithmetic number, because the mean of its divisors is an integer number (10735524075).

Almost surely, 2^21471048149 is an apocalyptic number.

It is an amenable number.

21471048149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21471048149 is an equidigital number, since it uses as much as digits as its factorization.

21471048149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 21471048149 in words is "twenty-one billion, four hundred seventy-one million, forty-eight thousand, one hundred forty-nine".