21220412343 has 32 divisors (see below), whose sum is σ = 30736876800. Its totient is φ = 12944779776.

The previous prime is 21220412303. The next prime is 21220412351. The reversal of 21220412343 is 34321402212.

It is a happy number.

It is not a de Polignac number, because 21220412343 - 2¹² = 21220408247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220412303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4003471 + ... + 4008767.

It is an arithmetic number, because the mean of its divisors is an integer number (960527400).

Almost surely, 2^21220412343 is an apocalyptic number.

21220412343 is a deficient number, since it is larger than the sum of its proper divisors (9516464457).

21220412343 is a wasteful number, since it uses less digits than its factorization.

21220412343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6191.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21220412343 its reverse (34321402212), we get a palindrome (55541814555).

The spelling of 21220412343 in words is "twenty-one billion, two hundred twenty million, four hundred twelve thousand, three hundred forty-three".