212820640445 has 16 divisors (see below), whose sum is σ = 291907836288. Its totient is φ = 145914388800.

The previous prime is 212820640433. The next prime is 212820640453. The reversal of 212820640445 is 544046028212.

It is not a de Polignac number, because 212820640445 - 2¹⁸ = 212820378301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212820640399 and 212820640408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147254 + ... + 668823.

It is an arithmetic number, because the mean of its divisors is an integer number (18244239768).

Almost surely, 2^212820640445 is an apocalyptic number.

It is an amenable number.

212820640445 is a deficient number, since it is larger than the sum of its proper divisors (79087195843).

212820640445 is an equidigital number, since it uses as much as digits as its factorization.

212820640445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823540.

The product of its (nonzero) digits is 122880, while the sum is 38.

Adding to 212820640445 its reverse (544046028212), we get a palindrome (756866668657).

The spelling of 212820640445 in words is "two hundred twelve billion, eight hundred twenty million, six hundred forty thousand, four hundred forty-five".