21400555452 has 24 divisors (see below), whose sum is σ = 51656514000. Its totient is φ = 6887534976.

The previous prime is 21400555441. The next prime is 21400555457. The reversal of 21400555452 is 25455500412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400555457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30747577 + ... + 30748272.

It is an arithmetic number, because the mean of its divisors is an integer number (2152354750).

Almost surely, 2^21400555452 is an apocalyptic number.

It is an amenable number.

21400555452 is an abundant number, since it is smaller than the sum of its proper divisors (30255958548).

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

21400555452 is a wasteful number, since it uses less digits than its factorization.

21400555452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61495885 (or 61495883 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 33.

The spelling of 21400555452 in words is "twenty-one billion, four hundred million, five hundred fifty-five thousand, four hundred fifty-two".