21243164444628 has 96 divisors (see below), whose sum is σ = 56691233544960. Its totient is φ = 6064891929600.

The previous prime is 21243164444603. The next prime is 21243164444629. The reversal of 21243164444628 is 82644446134212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243164444629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 842001118 + ... + 842026346.

It is an arithmetic number, because the mean of its divisors is an integer number (590533682760).

Almost surely, 2^{21243164444628} is an apocalyptic number.

21243164444628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21243164444628 is an abundant number, since it is smaller than the sum of its proper divisors (35448069100332).

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

21243164444628 is a wasteful number, since it uses less digits than its factorization.

21243164444628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32417 (or 32415 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 51.

The spelling of 21243164444628 in words is "twenty-one trillion, two hundred forty-three billion, one hundred sixty-four million, four hundred forty-four thousand, six hundred twenty-eight".