21356732140 has 24 divisors (see below), whose sum is σ = 45061701552. Its totient is φ = 8502204480.

The previous prime is 21356732129. The next prime is 21356732147. The reversal of 21356732140 is 4123765312.

It is a super-2 number, since 2×21356732140² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21356732096 and 21356732105.

It is not an unprimeable number, because it can be changed into a prime (21356732147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2526199 + ... + 2534638.

It is an arithmetic number, because the mean of its divisors is an integer number (1877570898).

Almost surely, 2^21356732140 is an apocalyptic number.

21356732140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21356732140 is an abundant number, since it is smaller than the sum of its proper divisors (23704969412).

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

21356732140 is a wasteful number, since it uses less digits than its factorization.

21356732140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061057 (or 5061055 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21356732140 in words is "twenty-one billion, three hundred fifty-six million, seven hundred thirty-two thousand, one hundred forty".