21454445412 has 72 divisors (see below), whose sum is σ = 56642040000. Its totient is φ = 6840237888.

The previous prime is 21454445393. The next prime is 21454445443.

21454445412 is a `hidden beast` number, since 21 + 4 + 54 + 44 + 541 + 2 = 666.

21454445412 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57912 + ... + 215087.

It is an arithmetic number, because the mean of its divisors is an integer number (786695000).

Almost surely, 2^21454445412 is an apocalyptic number.

It is an amenable number.

21454445412 is an abundant number, since it is smaller than the sum of its proper divisors (35187594588).

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

21454445412 is a wasteful number, since it uses less digits than its factorization.

21454445412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273105 (or 273100 counting only the distinct ones).

The product of its digits is 102400, while the sum is 36.

The spelling of 21454445412 in words is "twenty-one billion, four hundred fifty-four million, four hundred forty-five thousand, four hundred twelve".