21444770447782 has 8 divisors (see below), whose sum is σ = 35091442550952. Its totient is φ = 9747622930800.

The previous prime is 21444770447677. The next prime is 21444770447951. The reversal of 21444770447782 is 28774407744412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21444770447782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487381146519 + ... + 487381146562.

It is an arithmetic number, because the mean of its divisors is an integer number (4386430318869).

Almost surely, 2^{21444770447782} is an apocalyptic number.

21444770447782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21444770447782 is a deficient number, since it is larger than the sum of its proper divisors (13646672103170).

21444770447782 is a wasteful number, since it uses less digits than its factorization.

21444770447782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974762293094.

The product of its (nonzero) digits is 78675968, while the sum is 61.

The spelling of 21444770447782 in words is "twenty-one trillion, four hundred forty-four billion, seven hundred seventy million, four hundred forty-seven thousand, seven hundred eighty-two".