21469202820 has 192 divisors, whose sum is σ = 72013536000. Its totient is φ = 5278666752.

The previous prime is 21469202791. The next prime is 21469202851. The reversal of 21469202820 is 2820296412.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11364436 + ... + 11366324.

It is an arithmetic number, because the mean of its divisors is an integer number (375070500).

Almost surely, 2^21469202820 is an apocalyptic number.

21469202820 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 21469202820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36006768000).

21469202820 is an abundant number, since it is smaller than the sum of its proper divisors (50544333180).

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

21469202820 is a wasteful number, since it uses less digits than its factorization.

21469202820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 21469202820 in words is "twenty-one billion, four hundred sixty-nine million, two hundred two thousand, eight hundred twenty".