21053427049 has 2 divisors, whose sum is σ = 21053427050. Its totient is φ = 21053427048.

The previous prime is 21053427037. The next prime is 21053427119. The reversal of 21053427049 is 94072435012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19835905600 + 1217521449 = 140840^2 + 34893^2 .

It is a cyclic number.

It is not a de Polignac number, because 21053427049 - 2⁷ = 21053426921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21053426999 and 21053427017.

It is not a weakly prime, because it can be changed into another prime (21053427149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526713524 + 10526713525.

It is an arithmetic number, because the mean of its divisors is an integer number (10526713525).

Almost surely, 2^21053427049 is an apocalyptic number.

It is an amenable number.

21053427049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053427049 is an equidigital number, since it uses as much as digits as its factorization.

21053427049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 21053427049 in words is "twenty-one billion, fifty-three million, four hundred twenty-seven thousand, forty-nine".