21222400442140 has 24 divisors (see below), whose sum is σ = 44567160300432. Its totient is φ = 8488937439360.

The previous prime is 21222400442107. The next prime is 21222400442161. The reversal of 21222400442140 is 4124400422212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21222400442099 and 21222400442108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7642387 + ... + 10042453.

It is an arithmetic number, because the mean of its divisors is an integer number (1856965012518).

Almost surely, 2^{21222400442140} is an apocalyptic number.

21222400442140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222400442140 is an abundant number, since it is smaller than the sum of its proper divisors (23344759858292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222400442140 is a wasteful number, since it uses less digits than its factorization.

21222400442140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842197 (or 2842195 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 21222400442140 its reverse (4124400422212), we get a palindrome (25346800864352).

The spelling of 21222400442140 in words is "twenty-one trillion, two hundred twenty-two billion, four hundred million, four hundred forty-two thousand, one hundred forty".