21797356900 has 36 divisors (see below), whose sum is σ = 51600291120. Its totient is φ = 7926311200.

The previous prime is 21797356849. The next prime is 21797356901. The reversal of 21797356900 is 965379712.

It is a super-2 number, since 2×21797356900² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21797356901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9906790 + ... + 9908989.

It is an arithmetic number, because the mean of its divisors is an integer number (1433341420).

Almost surely, 2^21797356900 is an apocalyptic number.

21797356900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21797356900 is an abundant number, since it is smaller than the sum of its proper divisors (29802934220).

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

21797356900 is a wasteful number, since it uses less digits than its factorization.

21797356900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19815804 (or 19815797 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 49.

The spelling of 21797356900 in words is "twenty-one billion, seven hundred ninety-seven million, three hundred fifty-six thousand, nine hundred".