211220004439 has 4 divisors (see below), whose sum is σ = 211225536400. Its totient is φ = 211214472480.

The previous prime is 211220004433. The next prime is 211220004449. The reversal of 211220004439 is 934400022112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211220004439 is a prime.

It is a super-2 number, since 2×211220004439² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220004433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2708307 + ... + 2785204.

It is an arithmetic number, because the mean of its divisors is an integer number (52806384100).

Almost surely, 2^211220004439 is an apocalyptic number.

211220004439 is a deficient number, since it is larger than the sum of its proper divisors (5531961).

211220004439 is an equidigital number, since it uses as much as digits as its factorization.

211220004439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5531960.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 211220004439 in words is "two hundred eleven billion, two hundred twenty million, four thousand, four hundred thirty-nine".