21676212140 has 96 divisors (see below), whose sum is σ = 50739877440. Its totient is φ = 7711948800.

The previous prime is 21676212137. The next prime is 21676212157. The reversal of 21676212140 is 4121267612.

It is a junction number, because it is equal to n+sod(n) for n = 21676212097 and 21676212106.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2585876 + ... + 2594244.

It is an arithmetic number, because the mean of its divisors is an integer number (528540390).

Almost surely, 2^21676212140 is an apocalyptic number.

21676212140 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 21676212140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25369938720).

21676212140 is an abundant number, since it is smaller than the sum of its proper divisors (29063665300).

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

21676212140 is a wasteful number, since it uses less digits than its factorization.

21676212140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8643 (or 8641 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

Adding to 21676212140 its reverse (4121267612), we get a palindrome (25797479752).

The spelling of 21676212140 in words is "twenty-one billion, six hundred seventy-six million, two hundred twelve thousand, one hundred forty".