21452776884 has 384 divisors, whose sum is σ = 75150028800. Its totient is φ = 5120962560.

The previous prime is 21452776871. The next prime is 21452776889. The reversal of 21452776884 is 48867725412.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 21452776884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452776889) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6077232 + ... + 6080760.

It is an arithmetic number, because the mean of its divisors is an integer number (195703200).

Almost surely, 2^21452776884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21452776884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37575014400).

21452776884 is an abundant number, since it is smaller than the sum of its proper divisors (53697251916).

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

21452776884 is a wasteful number, since it uses less digits than its factorization.

21452776884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620 (or 3612 counting only the distinct ones).

The product of its digits is 6021120, while the sum is 54.

The spelling of 21452776884 in words is "twenty-one billion, four hundred fifty-two million, seven hundred seventy-six thousand, eight hundred eighty-four".