21402143220 has 48 divisors (see below), whose sum is σ = 59932353600. Its totient is φ = 5706633216.

The previous prime is 21402143197. The next prime is 21402143221. The reversal of 21402143220 is 2234120412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402143221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1073059 + ... + 1092821.

It is an arithmetic number, because the mean of its divisors is an integer number (1248590700).

Almost surely, 2^21402143220 is an apocalyptic number.

21402143220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21402143220 is an abundant number, since it is smaller than the sum of its proper divisors (38530210380).

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

21402143220 is a wasteful number, since it uses less digits than its factorization.

21402143220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37824 (or 37822 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21402143220 its reverse (2234120412), we get a palindrome (23636263632).

The spelling of 21402143220 in words is "twenty-one billion, four hundred two million, one hundred forty-three thousand, two hundred twenty".