21201422342120 has 16 divisors (see below), whose sum is σ = 47703200269860. Its totient is φ = 8480568936832.

The previous prime is 21201422342099. The next prime is 21201422342129. The reversal of 21201422342120 is 2124322410212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21109007558116 + 92414784004 = 4594454^2 + 303998^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21201422342120.

It is not an unprimeable number, because it can be changed into a prime (21201422342129) 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, 265017779237 + ... + 265017779316.

Almost surely, 2^{21201422342120} is an apocalyptic number.

21201422342120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201422342120 is an abundant number, since it is smaller than the sum of its proper divisors (26501777927740).

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

21201422342120 is a wasteful number, since it uses less digits than its factorization.

21201422342120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530035558564 (or 530035558560 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21201422342120 its reverse (2124322410212), we get a palindrome (23325744752332).

The spelling of 21201422342120 in words is "twenty-one trillion, two hundred one billion, four hundred twenty-two million, three hundred forty-two thousand, one hundred twenty".