21445533554412 has 96 divisors (see below), whose sum is σ = 55360499701248. Its totient is φ = 6406767360000.

The previous prime is 21445533554353. The next prime is 21445533554437.

It is a happy number.

21445533554412 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209703612 + ... + 209805852.

It is an arithmetic number, because the mean of its divisors is an integer number (576671871888).

Almost surely, 2^{21445533554412} is an apocalyptic number.

21445533554412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21445533554412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27680249850624).

21445533554412 is an abundant number, since it is smaller than the sum of its proper divisors (33914966146836).

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

21445533554412 is a wasteful number, since it uses less digits than its factorization.

21445533554412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124711 (or 124709 counting only the distinct ones).

The product of its digits is 5760000, while the sum is 48.

It can be divided in two parts, 2144553 and 3554412, that added together give a palindrome (5698965).

The spelling of 21445533554412 in words is "twenty-one trillion, four hundred forty-five billion, five hundred thirty-three million, five hundred fifty-four thousand, four hundred twelve".