21444822147782 has 16 divisors (see below), whose sum is σ = 35098541428032. Its totient is φ = 9745698020520.

The previous prime is 21444822147781. The next prime is 21444822147787. The reversal of 21444822147782 is 28774122844412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444822147781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97307948 + ... + 97528079.

It is an arithmetic number, because the mean of its divisors is an integer number (2193658839252).

Almost surely, 2^{21444822147782} is an apocalyptic number.

21444822147782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21444822147782 is a deficient number, since it is larger than the sum of its proper divisors (13653719280250).

21444822147782 is a wasteful number, since it uses less digits than its factorization.

21444822147782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194841043.

The product of its digits is 12845056, while the sum is 56.

The spelling of 21444822147782 in words is "twenty-one trillion, four hundred forty-four billion, eight hundred twenty-two million, one hundred forty-seven thousand, seven hundred eighty-two".