21711545000 has 40 divisors (see below), whose sum is σ = 50870161650. Its totient is φ = 8684616000.

The previous prime is 21711544999. The next prime is 21711545003. The reversal of 21711545000 is 54511712.

It can be written as a sum of positive squares in 5 ways, for example, as 2062794724 + 19648750276 = 45418^2 + 140174^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21711545003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2166155 + ... + 2176154.

Almost surely, 2^21711545000 is an apocalyptic number.

21711545000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21711545000 is an abundant number, since it is smaller than the sum of its proper divisors (29158616650).

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

21711545000 is an equidigital number, since it uses as much as digits as its factorization.

21711545000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4342335 (or 4342316 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 26.

The spelling of 21711545000 in words is "twenty-one billion, seven hundred eleven million, five hundred forty-five thousand".