21827949040 has 20 divisors (see below), whose sum is σ = 50749981704. Its totient is φ = 8731179584.

The previous prime is 21827948963. The next prime is 21827949043. The reversal of 21827949040 is 4094972812.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21827949043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136424602 + ... + 136424761.

Almost surely, 2^21827949040 is an apocalyptic number.

21827949040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21827949040 is an abundant number, since it is smaller than the sum of its proper divisors (28922032664).

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

21827949040 is a wasteful number, since it uses less digits than its factorization.

21827949040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272849376 (or 272849370 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 21827949040 in words is "twenty-one billion, eight hundred twenty-seven million, nine hundred forty-nine thousand, forty".