211220004449 has 2 divisors, whose sum is σ = 211220004450. Its totient is φ = 211220004448.

The previous prime is 211220004433. The next prime is 211220004469. The reversal of 211220004449 is 944400022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168709812049 + 42510192400 = 410743^2 + 206180^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220004449 - 2⁴ = 211220004433 is a prime.

It is a super-2 number, since 2×211220004449² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (211220004469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610002224 + 105610002225.

It is an arithmetic number, because the mean of its divisors is an integer number (105610002225).

Almost surely, 2^211220004449 is an apocalyptic number.

It is an amenable number.

211220004449 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220004449 is an equidigital number, since it uses as much as digits as its factorization.

211220004449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 211220004449 in words is "two hundred eleven billion, two hundred twenty million, four thousand, four hundred forty-nine".