21445482440 has 32 divisors (see below), whose sum is σ = 50350265280. Its totient is φ = 8205227712.

The previous prime is 21445482431. The next prime is 21445482469. The reversal of 21445482440 is 4428454412.

It is a junction number, because it is equal to n+sod(n) for n = 21445482394 and 21445482403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11654234 + ... + 11656073.

It is an arithmetic number, because the mean of its divisors is an integer number (1573445790).

Almost surely, 2^21445482440 is an apocalyptic number.

21445482440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21445482440 is an abundant number, since it is smaller than the sum of its proper divisors (28904782840).

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

21445482440 is a wasteful number, since it uses less digits than its factorization.

21445482440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23310341 (or 23310337 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 38.

The spelling of 21445482440 in words is "twenty-one billion, four hundred forty-five million, four hundred eighty-two thousand, four hundred forty".