21401341220 has 192 divisors, whose sum is σ = 54972825600. Its totient is φ = 6836037120.

The previous prime is 21401341219. The next prime is 21401341333. The reversal of 21401341220 is 2214310412.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21401341192 and 21401341201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64656455 + ... + 64656785.

It is an arithmetic number, because the mean of its divisors is an integer number (286316800).

Almost surely, 2^21401341220 is an apocalyptic number.

21401341220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21401341220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27486412800).

21401341220 is an abundant number, since it is smaller than the sum of its proper divisors (33571484380).

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

21401341220 is a wasteful number, since it uses less digits than its factorization.

21401341220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21401341220 its reverse (2214310412), we get a palindrome (23615651632).

The spelling of 21401341220 in words is "twenty-one billion, four hundred one million, three hundred forty-one thousand, two hundred twenty".