21106030680 has 480 divisors, whose sum is σ = 86877370800. Its totient is φ = 4569675264.

The previous prime is 21106030679. The next prime is 21106030697. The reversal of 21106030680 is 8603060112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3012942 + ... + 3019938.

Almost surely, 2^21106030680 is an apocalyptic number.

21106030680 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 21106030680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43438685400).

21106030680 is an abundant number, since it is smaller than the sum of its proper divisors (65771340120).

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

21106030680 is a wasteful number, since it uses less digits than its factorization.

21106030680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7053 (or 7033 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 21106030680 its reverse (8603060112), we get a palindrome (29709090792).

The spelling of 21106030680 in words is "twenty-one billion, one hundred six million, thirty thousand, six hundred eighty".