21454466445412 has 144 divisors (see below), whose sum is σ = 51450517778688. Its totient is φ = 7694864110080.

The previous prime is 21454466445397. The next prime is 21454466445421.

21454466445412 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 21454466445412.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9243408 + ... + 11329144.

It is an arithmetic number, because the mean of its divisors is an integer number (357295262352).

Almost surely, 2^{21454466445412} is an apocalyptic number.

21454466445412 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 21454466445412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25725258889344).

21454466445412 is an abundant number, since it is smaller than the sum of its proper divisors (29996051333276).

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

21454466445412 is a wasteful number, since it uses less digits than its factorization.

21454466445412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086146 (or 2086137 counting only the distinct ones).

The product of its digits is 14745600, while the sum is 52.

The spelling of 21454466445412 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred sixty-six million, four hundred forty-five thousand, four hundred twelve".