21910038049 has 2 divisors, whose sum is σ = 21910038050. Its totient is φ = 21910038048.

The previous prime is 21910038041. The next prime is 21910038053. The reversal of 21910038049 is 94083001912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21909920400 + 117649 = 148020^2 + 343^2 .

It is a cyclic number.

It is not a de Polignac number, because 21910038049 - 2³ = 21910038041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21910037999 and 21910038017.

It is not a weakly prime, because it can be changed into another prime (21910038041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10955019024 + 10955019025.

It is an arithmetic number, because the mean of its divisors is an integer number (10955019025).

Almost surely, 2^21910038049 is an apocalyptic number.

It is an amenable number.

21910038049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21910038049 is an equidigital number, since it uses as much as digits as its factorization.

21910038049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 21910038049 in words is "twenty-one billion, nine hundred ten million, thirty-eight thousand, forty-nine".