21220143432 has 64 divisors (see below), whose sum is σ = 54145281600. Its totient is φ = 6928262400.

The previous prime is 21220143431. The next prime is 21220143473. The reversal of 21220143432 is 23434102212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21220143431) 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, 365182 + ... + 419282.

It is an arithmetic number, because the mean of its divisors is an integer number (846020025).

Almost surely, 2^21220143432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220143432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27072640800).

21220143432 is an abundant number, since it is smaller than the sum of its proper divisors (32925138168).

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

21220143432 is a wasteful number, since it uses less digits than its factorization.

21220143432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54446 (or 54442 counting only the distinct ones).

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

Adding to 21220143432 its reverse (23434102212), we get a palindrome (44654245644).

The spelling of 21220143432 in words is "twenty-one billion, two hundred twenty million, one hundred forty-three thousand, four hundred thirty-two".