21403422049 has 2 divisors, whose sum is σ = 21403422050. Its totient is φ = 21403422048.

The previous prime is 21403421993. The next prime is 21403422083. The reversal of 21403422049 is 94022430412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18152711824 + 3250710225 = 134732^2 + 57015^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403422049 - 2¹⁷ = 21403290977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21403422049.

It is not a weakly prime, because it can be changed into another prime (21403462049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701711024 + 10701711025.

It is an arithmetic number, because the mean of its divisors is an integer number (10701711025).

Almost surely, 2^21403422049 is an apocalyptic number.

It is an amenable number.

21403422049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403422049 is an equidigital number, since it uses as much as digits as its factorization.

21403422049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 21403422049 in words is "twenty-one billion, four hundred three million, four hundred twenty-two thousand, forty-nine".